By the way, you might also investigate window managers, which aren’t as full-featured as DE’s but are even lighter on resources. Back in the day before KDE and Gnome, I used Window Maker , which is based on Steve Job’s NextStep’s UI. Only works with X, not Wayland, though. https://www.windowmaker.org/
Window maker is indeed amazing and would be a shame to loose. It was my go-to back in the day.