Steam has Proton now which is a god send for Linux gaming. https://www.protondb.com/ which is just a setting in the Steam client.

For games it depends on what might interest you. If you are into history sorta stuff, maybe Civilization V or VI? If you want more of a fun game that a lot of non gamers play, you try The Sims or Stardew Valley. If you want something like the current trend of games, try Helldiver’s 2 or Baldurs Gate 3.

If you ultimately don’t have a preference. Just browse the sales on steam for games that look interesting as well as browsing https://www.humblebundle.com/ which can sometimes be good. Just check it against that protondb or look up if the game runs good on Linux first before purchasing.

I know it will eventually be blocked by YouTube like Twitch did but you could try ublock Origin with this filter list or another custom filter list. Works pretty well for me.

https://github.com/gijsdev/ublock-hide-yt-shorts

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Mullvad or Proton. IVPN is also good.

Genuine question. What security concerns does luksCrypt have?