Can you reinstall without losing everything?

[filo]

For the KDE wallet password, best thing here

Kde daemon is asking for wifi password again and again

Try this: Select your WiFi connection in Network Manager and apply these settings: “All users may connect to this network” “Automatically connect to this network when it is available” “Store password for all users (not encrypted)” Then, reboot. Note: Storing your password unencrypted is a slight security risk if others have physical access to your computer. There is a possibility others who use your computer may be able to find your WiFi login credentials if it is not encrypted. Also if…

Or in the worst case the tip to workarouund the problem here
https://wiki.archlinux.org/title/KDE_Wallet#Unlock_KDE_Wallet_automatically_on_login