I highly recommend trying out other flavours of Ubuntu: Xubuntu (XFCE), Lubuntu (LXDE), Kubuntu (KDE), Ubuntu MATE, Ubuntu Budgie. Next week all should get 20.04 LTS release.
I don’t understand why you need different distributions for different DEs.
The only distro I’ve used past teenage is Ubuntu. I alternate stints of maybe 2 years with Windows, 2 years with Ubuntu. First thing I do after installing the most recent LTS Ubuntu is “apt install spectrwm”.
Spectrwm is not even particularly good — everyone tells me to use xmonad instead — but I know how to get it in usable shape in about half an hour. This after many moons of exclusively using Windows.