You definitely need to switch gear regularly. There's no better way to distract yourself from actually taking pictures.
If you DO stick with the same system for any period of time then you will HAVE to actually take pictures and possibly even deal with your mediocrity as a photographer. Then there's the whole self analysis thing that follows, 'am I good enough', 'are my pictures really that bad', 'why do I even bother' etc etc. NO ONE WANTS THAT. Keep swapping gear, testing, trying new things. The grass really is greener, or at least keep telling yourself that...
Olympus, Mamiya 645, Nikon, Canon FD, Yashica, Contax, Leica R, Mamiya RZ, Canon EF, Sinar, in chronological order, have all distracted me quite nicely. Oddly I'm back to using the Olympus and Mamiya 645 gear that I started with about 30 years ago, albeit adapted to Canon EF bodies. If only I'd been actually taking pictures the whole time, maybe I'd be half decent at it by now. Maybe.
Frankly, if I had your Olympus gear, and I do have the OM2n, 28/2 and 50/1.4 (and others), I'd keep it and use it.
JJ