What about a Turn-based RPG like Yakuza Like A Dragon? It’s open world, plays great on the deck, has amazing world building/ambience to it and it’s incredibly replayable. You can frequently find it on sale (or get a cheap key from G2A) and its sequel is coming out soon.

For me, it feels like an old school RPG with modern quality of life improvements and plenty of character.

When looking for a power bank suitable for the Steam Deck it needs to support atleast 45W Charging and you a suitable cable that will support this capacity (i.e a DECENT quality 3C cable).