Hi my cactus is looking a bit bad. Not sure about the brown marks and think the nuisance pest mouse might have tried chewing on it. It's also a bit top heavy. Can I do anything to help it so its more stable in the pot?

To keep the cactus from leaning, you could try using a couple of bamboo spikes would provide enough support.

Stake it, or plant it a bit deeper -- I think can probably go down an inch deeper than it is.

hi thanks sorry for late reply. I dont get notified off reples. I did repot it a bit deeper and looking better.