Android games are normally going to be inferior to Steam games, but this is still a nice option for games that aren’t available on Steam or can’t be played due to anti-cheat reasons.
You can read more about Waydroid here. There are reasons to believe valve is working on adding official Waydroid support to Deck, but until then you can install it this way.
I’ve heard you want to install Aurora store through F-droid, which should give you the x86 compatible version.
You can also try this, which can install libndk which lets you run some ARM apks on x86 (although installing x86 apks is recommended when possible).