Being a former Director of Global Marketing and originally a Community Manager for a crowdfunding startup in Silicon Valley, social media has been the center of my career for a long time now (almost five years and going). I've built up accounts from scratch and grew following and accounts that have already existed. Both are very different approaches, and different accounts have different growth strategies.
For blockchain communities, growth is mainly through Twitter, Instagram, Medium, and Telegram. So, these channels and the various target audiences. When I launched a new account, recently, for an online newsletter company distributing the latest funding rounds for the startups and beta projects all over the globe, I had to research existing, similar companies, and see what successes and failures they had in their marketing strategy and then go beyond and innovate into something different, using their successes to our advantage. So, I grew a community on Linkedin, focused on Instagram, started conversations on Twitter, and then built a partnership with a company I found that was doing something similar, an investor network, that failed in order to gain their following but improve their overall product.
Social media is easy, but in order to actually be successful you need to go along with the algorithm, yes, but you also need to go beyond that. You need to find companies and partners that will have you grow beyond and offer them something to improve their product as well.