Does a copper pipe need to be perfectly smooth to install a compression valve?
I have done four things with this second-hand olive issue:

wrap with 4 or 5 layers of ptfe then tighten normally. Usually is fine.

use a sealer such as plumbers mate or equivalent and that has also worked.

replace the olive but as you have compressed the pipe so much you may have to cut the pipe back. To do that you may have to get more pipe and pulling it may not be sufficient so you will have to get behind.

use a solder joint to put a fresh bit of pipe and push it back into the cavity but does depend on the cavity...