I accidentally switched to gnome, switching back to KDE causing to many issues

Hey everyone, I'm new to Linux and recently did some customisation. However, I ended up switching back and forth between KDE and GNOME. Now, I'm facing various issues, such as missing icons, the absence of the Nvidia server app, and disappearing KDE workspace. Additionally, I'm experiencing trouble with dual monitors and other issues. Can I reset everything without losing my data and remove the GNOME environment? (Any helps would be appreciated).
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