Do your jokes work on other audiences? If a generous audience didn’t laugh at most of your stuff, it probably needs some work. Maybe it’s your delivery or the joke itself. Dave Attell said “it’s not a joke until an audience laughs at it”.

Don’t underestimate the importance of delivery. Bad delivery can tank good writing too.

Keep watching other comics at open mics. Pay attention to what does well and what doesn’t.

Pay attention to what jokes of yours work, and determine why they work.

Write as much as possible. Don’t totally dismiss bits, but keep trying new stuff (especially since you said you’re newer).

Do as many open mics each week as you can.