Thank you. That's a great question. I often go based on great comments I see on my posts and other's posts. If I see an author resteemed into my feed often enough, I'll check out their blog and give them a follow. Sometimes I'll see content on the trending or hot pages which catch my attention and lead to further reading and following. I try to keep the number of people I follow on social media accounts low enough that I can actually follow people and see at least most of what they post. Many who do a "follow me because I followed you" approach end up with a feed that is mostly noise.
Another nice approach is check out the feed of authors you like and then just start following the same people they follow based on the content you like there.
Good luck! I'm 5,700+ posts into this thing for almost a year now, so it's really feeling like home for me.