That's a great list of core tasks which we may need to adhere to rank from now and in the future, and in addition to that I would also say that we should spend more efforts on content marketing and posts by focusing primarily on the User Experience even if we may need to slightly compromise on organic CTR and free resources. A main issue which I've seen is that for certain niches and/or countries/regions there are very few authoritative blogs which one could obtain quality links. I reckon that by getting brand mentions from press releases, news sites and providing quality resources it could add up to better rankings
Consider your competition. Look at what your competitors are doing and how they are performing in their search marketing before you decide how you can best compete with them. Research what search terms they rank organically for. Consider if you can execute a plan to top their SERP placements. Also, look at what paid terms they are using to drive traffic to their own sites. As you perform this research, look for gaps that you can fill and areas where you will be unable to compete in both paid and organic search.
Starting with the search term dog food, I see related more specific terms like dog food reviews, dog food comparison, and dog food brands, which can help identify other keywords to focus on. Then, clicking on dog food brands, the search engine automatically expands that keyword to be another hub, with more specific keywords related to dog food brands such as nutro dog food, Purina dog food, and so on.
There are many reasons explaining why advertisers choose the SEM strategy. First, creating a SEM account is easy and can build traffic quickly based on the degree of competition. The shopper who uses the search engine to find information tends to trust and focus on the links showed in the results pages. However, a large number of online sellers do not buy search engine optimization to obtain higher ranking lists of search results, but prefer paid links. A growing number of online publishers are allowing search engines such as Google to crawl content on their pages and place relevant ads on it.[17] From an online seller's point of view, this is an extension of the payment settlement and an additional incentive to invest in paid advertising projects. Therefore, it is virtually impossible for advertisers with limited budgets to maintain the highest rankings in the increasingly competitive search market.

In the old days, if we wanted to know who Brad Pitt’s first wife was, we would translate our thoughts into a search-friendly query, like “Brad Pitt’s wives”. Now, we simply tell Google what we want: “Who was Brad Pitt’s first wife?”. This is one of the main reasons why 15 percent of searches have never been heard of before by Google every single day.
So we want Googlebot's spiders to be able to come to this page, to understand the content that's on there in a text readable format, to understand images and visuals or video or embeds or anything else that you've got on the page in a way that they are going to be able to put into their web index. That is crucial. Without it, none of the rest of this stuff even matters.
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.