Docker: can't upgrade past 2021.6.6

I’m currently stuck on HA Version 2021.6.6 on one of my installs, and I can’t even figure out how to troubleshoot the problem because it seems like it is just stuck restarting the docker container. I’ve not been using docker long, so I don’t know what steps to take to see information about the startup process before the interface becomes accessible. I’ve tried upgrading to multiple subsequent versions and none seem to work. Hardware is a raspberry pi 4.

Do you use docker compose ? If yes please show it
If not, please give the line you use

As you’re not very familiar with docker, maybe first describe the procedure you apply for upgrading, then what brings you to the conclusion that “it is stuck”.