Free advice of the day from a professional nobody:
Do not follow back anyone who follows you who are also following 20030489458 other people but only a few are following them. They didn't follow you because they think you're cool, they don't care about your posts and will never read them. Let them follow you, but ignore them, they are just social media smarty pants. Fuck them.
There you go, now you can apply this wonderful life-hack to your life and you didn't have to spend a penny!