Looks fine.
Still somehow was not included above …
cd ~/.config && for j in plasma*; do mv -- "$j" "${j%}.bak"; done && mv Trolltech.conf Trolltech.conf.bak && rm -rf ~/.cache/* && kbuildsycoca6 --noincremental && cd ~ && echo -e "\nFinished Clearing Plasma Settings and User Cache.\n\nPlease Reboot.\n"
Its the one-line equivalent of the multiple commands usually employed after big plasma upgrades … removing cache and configs.
One of the other mods here also created a script
This should have been done earlier when setting defaults back to breeze.
And will reset desktop settings.
If you havent noticed any weird issues it may be skippable I guess, but previous experience was that every system undergoing upgrade from plasma5 > plasma6 would want to run them.
(ex: Problems after Plasma 6 update - #2 by cscs)
And the archwiki section with the separate minimal steps for reference
https://wiki.archlinux.org/title/KDE#Plasma_desktop_behaves_strangely