Figured I'd let more knowledgeable people answer this one. It's a very common question. Guess it came at a bad time.
Anyway, where have you tried? Mastodon is good for finding an audience, because it's full of real people who love to hear what others are making. There are good game-oriented instances too, including some for developers. Your own site is also a good place, doubly so if you post updates with some regularity. Forums too, both here and elsewhere. Bonus points if they're niche forums for your game's genre. It takes patience, persistence and luck, but you can gather a decent audience if you keep at it.