I've been in the rc car game for only a few month tops, but I've been in the rc plane and heli game for over a decade. the way I coped with sooo many different classes and competitions was pretty much based on my comfort level.
If i felt stressed or overwhelmed with too many events, too many requirements, too many damn setups, I would pull back my reach, maybe drop one or two classes.
If I was comfortable where I was but felt I could squeeze in a few more sessions then I would, otherwise I just left it as it was.
My personal opinion is go with what your comfort level and also budget level can sustain with some room to spare
