Calling Linux's version of DVR a "viable video editor" is rich given that a. It doesn't work on most distros (it's designed for Rocky Linux. It throws a fit on any other distro. You need to jerry-rig it), requiring a whole thang to get it to play nice; and that b. It doesn't support any of the video formats and codecs people actually want to use, for seemingly no reason, since the Windows version supports those formats just fine.
KDENLiVe is like, fine for a simple project, but you quickly start hitting your head on its limitations. Plus its UI sucks just in general.
Video editing is the reason I keep a small Windows install, because sometimes I need to do video stuff for work and -- Sorry. No. No Linux video editor even compares to the likes of Premiere and Vegas. They're still barely above Windows Movie Maker.
GIMP is a perfectly serviceable image editor, and yes, GIMP 3 is a major improvement -- But it's kinda missing a lot of things Photoshop users take for granted, and its UI and hotkeys are very idiosyncratic, which makes migrating very hard (... I sorta have the opposite problem though. I learned image editing on GIMP and all my muscle memory is GIMP oriented, so even when I'm on my 'time to work' windows install, I only really open PS if I desperately need one of its exclusive functions)