PC Gaming

I saw some people recommending me commenting the games I like:

Stardew Valley
Bioshock Infinite
The Last of Us
Call of Duty

Outer Wilds. but in fear of spoiling it, I cannot tell you what makes it good. Jump in without knowing anything about the game is the best way to enjoy it.

Roguelites sound like a good fit for something to quickly grab your attention. There's all kinds of them but I'll go ahead and list off Hades, Dead Cells, Risk of Rain 2, and Streets of Rogue as just a few of the greats.

Deep Rock Galactic, as mentioned elsewhere, is also amazing. Depending on the type, you can do a mission or two in a 30 minute timeframe.

I'll throw DSP (Dyson Sphere Program) into the ring. Imagine Factorio or Satisfactory, just more eh ... chill vibes? And as a friend of mine put it, you "dont need to have a PhD to understand logistics", which may be a positive or a negative depending on your outlook, I guess.
And you're colonizing planets and star systems in order to build the titular Dyson Sphere.

Is it perfect? Nah, also to play multiplayer (which I am) you need to whip out your modding tools, so to speak.

Gotta shill Warframe, my 6,000 hours can't have been for nothing.

You might have a look into arena/match like multiplayer games, I found they match the 20-30min gameplay and moving on very well. Closer recommendations would need more information about your interests in games. Good luck!