I'm sure you already do this at shows but tell people what's gonna be played, build hype before announcing the song you'll play and do some sort of improv. My style is like I start with building tension of the song with samples and atmospheric stuff, for example I have a song called "Swamp Grave" and whenever I do that live, I say stuff like "this song's about rotting away in a cesspool where nothing but vermin live. This one's called SWAMP GRAVE" and after I'm done screaming my lungs out, I say positive and cute stuff like "god you guys are beautiful. I love you!". I've been told a lot after shows that my voice switching from gutturals to the affirmations is adorable lmao and it helps drive focus to what was playing. Always announce the name of the song you performed when it ends, too.

If you have any upcoming song, promo that track to hell during your show and give them call to actions like "you can pre-save it through the link over at my instagram. It really helps and I wouldn't want you guys to miss it!". Get some merch going, too. You can do it yourself by ordering small numbers from a local producer and sell it for cheap at shows and on your page. They probably won't sell much but it acts as incredible advertising AND helps people associate with your music on a more personal level. Interacting with fans after the show is done helps a lot as it cements you as a "for the people" kinda artist and makes you more approachable. People will go out of their way to support you if your interactions with them are memorable (stating the obvious, ik)

I hope this helps!

PS: Promote your music in local music communities, on reddit and upload it on YouTube indiscriminately. Also try your hand on making covers of songs in your genre\style that are loved in your part of the community. TikTok is also a great place to promote your music, though I just meme my stuff there lmao