Some games are better than others for this equipment. Its not a hig end gaming PC so yeah, tone down the graphics, go 2D, and games that work well in short sessions, you will probably have a better time. Things to try on it:
Slay the spire 1 and 2
Into the Breach
Dead Cells
Hollow Knight 1 and 2
Blasphemous 1 and 2
Ball X Pit
Dome Keeper
Katamari (any)
30XX, 20XX
Tunic
Mewgenics
XCOM Enemy Unknown, Xcom 2
Deep Rock Survivor
Cult of the Lamb
Stardew Valley
Hades 1 and 2
Dave the Diver
Cuphead
The Outer Wilds
Some longer session or more demanding things that work:
The Alters - I felt like medium graphics was fine on this one.
The Witcher 3 - remaster has a steam deck preset.
Valheim - switch to classic controls, default is nonsense but otherwise runs fine.
HiFi Rush
A Plague Tale (1 and 2)
God of War ran surprisingly well
Clair Obscure, sort of. A little rough sometimes, but playable
Subnautica
Sekiro
Control, if you turn down the graphics
Elden Ring runs. I dont like multiplayer on wifi though
Monster Hunter Rise and World
Resident Evil 8 and earlier
Theres really no shortage of good choices for the deck. Like sure, most of that stuff didnt come out this year... But neither did the deck.