Where do you promote fics?

If you promote them at all—because I haven’t been promoting mine but I’m wondering, where is the most popular place people promote? I’m assuming like Twitter/blue sky but I don’t have those or any other social media related to fandom. I don’t really want to keep up with any fandom social media besides AO3. Is there like a discord or something? Idk

Specifically for MHA but just in general as well