All you can do is reset your Umbrel user data
Do this only if you do not have any funds on your LND wallet! If you have funds, then save your seed and backup file so you are able to restore it later.
Warning! You are going to loose your seed, settings, data and all installed applications!
Run the following command to rest your Umbrel:
$ sudo systemctl stop umbrel-startup && sudo rm -rf ~/umbrel/lnd/!(lnd.conf) && sudo rm ~/umbrel/db/user.json && sudo rm ~/umbrel/db/umbrel-seed/seed && sudo systemctl start umbrel-startup