You gotta browse through the list of communities and go more niche lol. For example, I’m subscribed to stuff like aquariums and plantscaping, travel, NFL, horror movies, awwducational, 2000snostalgia, food, ramen, true crime. Of course local communities, my state and local area for example. I like birds, so birding, why not? I’m watching kaiju movies now, so I subscribed to a kaiju community. Specific games I like. Specific music genres I like, shoegaze for example, but alternativenation’s an easy start. Explain like I’m five (ELI5) and Today I Learned (TIL) are popular and not full of downer stuff. I’m subscribed to stuff even if there are no\few subscribers, because one day, there will be more.
The only thing that sucks is that I’m also subscribed to tech and news, and being that those communities are the most popular, they’re always flooding the top of my feed. Sorting by “hot” helps.