I don't think I can commit to getting in the gym this offseason, but could I still help myself by doing body weight and dumbbell stuff at home?
I think so. You might not see huge strength or performance gains, but it could indirectly help with injury prevention, form, and whole-body wellness. I realize that last one is a bit vague.
After suffering through a couple months of knee problems last off-season (as I have before), I started doing at-home body weight and dumbell strength work, focusing on glute and VMO muscles, and I feel like it's been hugely beneficial. One's "feelings" aren't exactly objective or measurable, but those feelings have translated to better headspace on and off the bike.
At some point I would consider getting back into fundamentals lifts like squats and deadlifts, but I personally don't want to deal with the hassle of the gym at this point. Maybe if I get home/garage setup for that eventually. I'm doing 20-30 lb dumbell weighted lunges and high box step-ups, and outside of that my routine is pretty light tbh. I still do it once/week and im conditioned enough such that it doesn't detract from the following day's bike performance. Pure maintenance.