This was my first time publishing and submitting something to a jam, I can only tell you what I did.
I recommended, shared and promoted my game everywhere I could. Twitter, Discord Servers, Reddit, Facebook, friends and family without asking if they know what a TTRPG is, other creators that were willing to check me out. I tried to be as modest and less invasive as possible in the process and my game is doing decently.
I don't know if you did something like that.