Search for blogs that cover similar topics. Use a search engine and the search bar on blog hosting sites to find blogs that cover your topic or related topic. Read a few blog posts from the most popular ones, that show up high on the search ranking, have the most comments, or display a readership of 20,000 or more. Get an idea for how much interest and competition there is.
Working with advertising networks isn’t your only option when it comes to selling ads. If you end up with enough traffic, advertisers may come directly to you and ask you to place their ad on your site. You can also contact advertisers yourself. The biggest difference from the above mentioned option is that there is no middle man, which means you can set your own ad rates.
IF something like that were to happen I surmise we can reasonably expect some sort of announcement/warning to the approved API partners (and probably even to the general public). I would say it’s almost impossible they’ll push through some sort of update that suppresses auto-pinned content without us knowing (at least a little) ahead of time, thus giving us time to adjust accordingly.
Your newsletter is all yours. Unlike with social media websites like Pinterest and Facebook, your newsletter and email subscribers are all yours, and you have their undivided attention. You don't have to worry about some social media algorithm not showing your content to your readers, as they are your email subscribers so you aren't fighting with anyone else to have them see your content.
Success in every facet of life is based on who you know and not what you know 🙂 The secret is to start connecting with more people, if you build your network wide enough you’ll meet someone who can help you, no matter what it is that you are trying to achieve. Some meet these influential people more quickly by complete luck of the draw, others need to keep plugging along longer. The system works either way, and whether or not it works better for others is irrelevant, all systems in life work better for some than others.