One of the reasons for a traffic drop can also be due to your site losing links. You may be seeing a direct loss of that referral traffic, but there could also be indirect effects. When your site loses inbound links, it tells Google that your site isn't as authoritative anymore, which leads to lower search rankings that in turn lead to traffic drops (because fewer people are finding your site if it's not ranked as highly and more).
Additionally, there are many situations where PPC (a component of SEM) makes more sense than SEO. For example, if you are first launching a site and you want immediate visibility, it is a good idea to create a PPC campaign because it takes less time than SEO, but it would be unwise to strictly work with PPC and not even touch search engine optimization.
BrightEdge research supports that a blended approach is best for delivering high performing content. Not only will combining organic and paid search increase website traffic, but it will offer a bigger return on the investment. Take Retail, Technology and Hospitality industries, for example — organic and paid search combined make up more than two-thirds of their total revenue.
Secure (https) to non-secure sites (http): Since Google began emphasizing the importance of having a secure site, more websites are securely hosted, as indicated by the “https” in their URLs. Per the security protocol, however, any traffic going from a secure site to a non-secure site will not pass referral information. For this issue, you can correct by updating your site to be secure through a third-party SSL certificate.
The Methods and Tactics: You know that a lot of your clients look for idea online. So you determine to reach people where they are. You will show them all the amazing and creative things they can make with what you sell. You also want to reach people in all steps of the project and buying cycle. This means that you will want to have content for the project conception, idea gathering, planning, purchasing, and creating.
Local SERPs that remove almost all need for a website. Then local SERPs, which have been getting more and more aggressively tuned so that you never need to click the website, and, in fact, Google has made it harder and harder to find the website in both mobile and desktop versions of local searches. So if you search for Thai restaurant and you try and find the website of the Thai restaurant you're interested in, as opposed to just information about them in Google's local pack, that's frustratingly difficult. They are making those more and more aggressive and putting them more forward in the results.
As an Internet marketing strategy, SEO considers how search engines work, the computer programmed algorithms which dictate search engine behavior, what people search for, the actual search terms or keywords typed into search engines, and which search engines are preferred by their targeted audience. Optimizing a website may involve editing its content, adding content, doing HTML, and associated coding to both increase its relevance to specific keywords and to remove barriers to the indexing activities of search engines. Promoting a site to increase the number of backlinks, or inbound links, is another SEO tactic. By May 2015, mobile search had surpassed desktop search.[3] In 2015, it was reported that Google is developing and promoting mobile search as a key feature within future products. In response, many brands are beginning to take a different approach to their Internet marketing strategies.[4]

Developing an organic content marketing system means putting content in the right places. It’s important to understand the core demographics your content reaches. Social media platforms provide a vibrant and instantly engaged audience. These audiences comprise a staggering 42 percent of the world population. But, not all platforms are equal in terms of their marketing potential. For example, Facebook commands the lion’s share of users, with 2.167 billion active users as of January 2018. Instagram and Snapchat are where the younger audience hangs out. Statistics from 2016 reveal 59 percent of 18- to 29-year-olds use Instagram. And 56 percent of under-30s use auto-delete apps.
To find the right people I downloaded a list of some of the most popular users within the community. To do this, I used Screaming Frog SEO Spider to gather a list of all the URLs on the website. I then exported this list into an Excel spreadsheet and filtered the URLs to only show those that were user profile pages. I could do this because all of the profile pages had /user/ within the URL.
SEO may generate an adequate return on investment. However, search engines are not paid for organic search traffic, their algorithms change, and there are no guarantees of continued referrals. Due to this lack of guarantees and certainty, a business that relies heavily on search engine traffic can suffer major losses if the search engines stop sending visitors.[60] Search engines can change their algorithms, impacting a website's placement, possibly resulting in a serious loss of traffic. According to Google's CEO, Eric Schmidt, in 2010, Google made over 500 algorithm changes – almost 1.5 per day.[61] It is considered wise business practice for website operators to liberate themselves from dependence on search engine traffic.[62] In addition to accessibility in terms of web crawlers (addressed above), user web accessibility has become increasingly important for SEO.
What you are in fact talking about, are Google's death stars like the Shopping box, Knowledge Graph etc. It's fully understandable why many SEOs can't stand them 'cause whole categories of websites (price comparison platforms, for instance) have already fallen victim of such death stars, and there will be certainly numerous other portals, which will lose almost all of their traffic in the near future. Despite your (quite good) suggestions on how to circumvent such an issue, the situation for such an endangered portal can be hopeless when it's its whole business model, which a new Google feature makes obsolete. See geizhals.at for a very famous example.
As you can see by the example above, organic marketing tactics are natural, authentic, and value-based. The benefits that businesses reap from these tactics are cultivated over longer periods of time, ultimately helping you build a brand that customers want to visit regularly. And although you’re doing less “pushing” with organic marketing, when done right you can still generate a steady stream of loyal traffic. Remember, this is about building high-value brand equity and industry authority with your customers. You’re not just attempting to drive sales here; you’re working hard to engage and educate your target audiences.  
● Collect conversion related data from your PPC campaign and use it to convert your organic search visitors better. Also, keywords that worked for you in PPC are best to optimize your website for, so using them for SEO purposes makes sense. Your PPC campaign will end, but the rankings you achieve for the same keyword will remain for quite some time.
Organic is what people are looking for; the rest of these simply put things in front of people who may or may not be seeking what you offer. We know that approximately X number of people are looking for Y every day. So if we can get on front of those people, we have a much greater opportunity to create long-term relationships and increase our overall ROI.
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