That's the most difficult part is finding who to follow (likely strangers) when you first start. You could watch the global timeline or search some #hashtags for things you are interested in or try to pick the right server with a like-minded userbase from the get-go. However, these issues aren't too different than any other social media tbf. And eventually you find interesting people exclusive to the Fediverse or post different content on it that is more interesting. Mastodon and others never force being social and following others though.
I guess both work. On Instagram and Tumblr I can follow people and hashtags, on Twitter I can follow people and topics. On forums, you basically navigated by topic, without following any specific person.
