Want to reinstall or repair

Hello

I want to try reinstall or repair my actually instance from my NC.

I have a problem with the config and updates.

Before I make a complete new Installation, I want to trying a repair.

If this possible ?
Is there a way ?

curl -sSL https://raw.githubusercontent.com/nextcloud/nextcloudpi/master/install.sh | bash

Possibly, depends what broke. What is your problem ?
Most anything is fixable.
You will have to spend some time gathering and sharing info on your system and post logs, if you want someone to look into it.
Sometimes a fresh install, followed by restore, is quicker and less headache.