Everything except the packages shown in the DE section.
You can use the command nmtui to connect to your wifi network.
That being said, there is no reason to reinstall to install KDE. You can do that from your current install.
You can install eos-packagelist and then run
eos-packagelist KDE-Desktop --install
That will install all our KDE packages into your current install.
It shouldn’t change any settings so it shouldn’t break anything.