I recommend scrolling through your local instance's timeline and finding out. Or if it's quiet (perhaps you've rolled your own?) you can often browse other instance's, even without an account. If you're feeling brave, try the federated timeline; this will need some liberal use of the block / instance block feature before it's a manageable firehose, though :-)
Any good / mature client will let you search for tags, and will give you posts and profiles that mention them. This is one of the best ways to find people and conversations that interest you. You can also "pin" tag searches as a timeline and then they're always there, always showing conversations that may interest. You can often add several tags to one timeline to group interests.
Make sure your profile has a bio in it and you've added your interests as tags in your profile. Helps folk who are searching for contacts able to find you. Make a new #introduction post, with your interests as tags and you may find people randomly finding you and connecting. When you post, if it's relevant to include tags, make sure you do so - again so we can find you if we want to talk about that, too.
We don't know what interests you, what turns you off, and what you want to engage with. You're the best person to answer this question but it does require a little bit of legwork :-)