Hey Ben,
Thanks for the offer! I don’t know how many people here will take you up on your offer (since most TTRPG adventures lack bespoke sound effects and music), but there’s a chance someone would be interested in your offer.
You might want to look at the My First Game Jam. They have a thread for people looking for teams,which might provide more opportunities for you to provide sound-based services. There’s also an entirely music-focused jam called the Town Music Jam. That might be worth checking out.
Thanks again for the offer. Hopefully someone takes you up on it!