I deleted a .plist file and now can’t eject disc and disc not recognized on MacBook Pro

I’d start with creating complete and current backups, as backups are the only way to mark data as being valuable. Without backups, important data and precious photos can be one mistake, one drop, one ding, one loss, one corruption, one dunk, one theft away from irrevocable loss. Time Machine is good at this, and there are other fine choices.

What to do here? Reinstall thenKiwi app involved, and test again.

If you can’t shutdown normally, you can hold the power button for ~ten seconds to force a shutdown.

For assistance with the app, check with the app vendor.