Profile app won't verify

Solution 1:

The profile for the jailbreak was revoked by Apple, and you need to reinstall the app from wherever you installed it.

I would recommend using ignition.fun to install it again. The ignition.fun website will say at the top whether their applications are signed or not, which will tell you if you can install apps such as unc0ver from the website or not.

If you don't want to have to deal with the jailbreak apps being revoked, you can install the tweak ReProvision from the repository https://repo.incendo.ws which will allow you to automatically resign apps using your Apple ID.