I made the switch to Linux about 1.5 years ago. Never looked back. I started with Linux Mint and have been happy with it ever since. Now, I’m learning about Arch Linux and trying to make that my primary driver.
FYI, you don’t have to get a Steam Deck to try out gaming. I’m sure your current distro would support that quite well. But, if you’re looking for something that is portable, then I definitely recommend the Steam Deck. Now is a good time to get one, since they released a refresh with an OLED screen. Also, the Steam Deck runs on Arch Linux, so if you’re ever interested in checking that out, then definitely get a Steam Deck.