If I had time, energy, etc etc
I would create a "distro" of GIMP:
- reskinned UI (imagine running GIMP in "Photoshop mode"), so that transitioning was easier. I mean, it's twenty-freaking-eighteen and Excel still responds to the "/" key. You know, in case Rip Van Winkle wants to finally come over from Lotus 1-2-3.
- Bury the GIMP name. Yes it's logical. No it won't pass muster in (e.g.) sensitive American workplaces. Stupid? Perhaps. But not a hill worth dying on. Call it something fun, or functional, and move on.