I'm sure hillclimbs would be a lot more fun than the mickey mouse affair which sprints often are, but my experience of motorsport is that, you end up tailoring your car to the apparent regs for your class.
Then all it does is cost loads of money as you look for ways to ensure your car is competitive. If your car is not competitive there is no point (for me) in taking part.
Tbh, I really think my car is getting to the point now where it is a bit too good for doing competitive motorsport. It's a daily driver, full loaded with aircon, interior etc and I've just had all the bodywork done.
I honestly wouldn't have dreamt of doing it in the 100hp when I had it.
Whilst it can be fun improving your times, I've got a fair few local friends who do a sprint series. It just seems to be an ongoing battle for maximum power over everything else. Really not my style.
I have seen autosolos, novice type events like this have zero interest for me.
I am quite happy to do 3 or 4 trackdays a year and enjoy my car that way as at least my fiance can enjoy it too and I can carry on giving him some tuition which I very much enjoy.

I may also from time to time do the odd drift day as that's good fun, but would only choose the bigger places like Mallory etc as have done the car park type drifting before and it does hammer your car something rotten.
Going back a few years I did my racing, loved it and all that, but blimey the cost of it is just stupid. I say that and I never had to pay an entry and I was driving other people's cars'. Just not do-able unless that's all you are going to do. Or you happen to be loaded. It really is hard to beat racing against other cars on track, but the inevitable damage (there was nearly always some kind of mark or dent) from close racing at the sharp end, just adds more to the cost.
So, unless someone pops up and offers me a seat driving their race car, I've no current intention to return to competitive motorsport, I'm very happy just be out there on track enjoying my car with the other half.