2004 Prius with 350k and a handful of error codes

I recently purchased a 2004 Prius with about 350,000km on it. The vehicle had been in a minor collision about a year ago which crumpled the hood but appeared to only cause cosmetic damage. Still get 4.0-5.0L/100km on the highway and seems to drive fine. Sometimes it has a cold rattle.

Last month I had the water pump replaced. The bearing on it was wrecked and had shredded the serpentine belt. Now the check engine light (CEL) has come on and I pulled the following codes using an OBD2 reader:

P0117
P0138
P0300
P0301
P0302
P0304
P0420
P1121

Based on a cursory google search, none of these codes are serious enough to immediately stop driving the car. But obviously I would prefer fixing whatever can be fixed.

I am planning on looking into a few things to diagnose these codes. The O2 sensor by the catalytic converter, the spark plugs, and the coolant control valve. Does anyone have suggestions for what else I can look in to, or steps they would advise taking?