Pages frequently crashing multiple times an hour.

Reboot your Mac. Then, press the shift key before launching Pages (presumably v12.2.1) as that prevents Pages from loading its last executation state (crash), and may make a difference in stability.

Have you attempted to disable any fonts in Font Book?

Are you running any unnecessary anti-virus application or so-called "mac cleaning" applications? Sometimes, they can remove components of an application that cause instability or pure mayhem.

Have you contacted MyApple. The techs there can be quite helpful. ‭1 (800) MYAPPLE‬. I've been an Apple afficionado for over 30 years, but things are going downhill fast in many ways. My MacBook Pro is literally a $2500.00 piece of garbage. The support people at MyApple have helped me out dozens of times with situations similar to what you're talking about here. If only we could bring Steve Jobs back from the dead!