Debian Stable is really, really close for gaming, since Ubuntu LTS itself is based on Debian Unstable branch, if you choose to upgrade with more Linux knowledge in future. Nobara is dedicated to gaming.

Honestly speaking, I keep W10 on SSD for games if any works in a wonky manner on Linux. Takes like 30 seconds to log off Debian, boot into Windows, fire up a game, get back to Linux when not playing.