

Entertainment is valuable, it’s what helps us get through the stuff we don’t want to do. Looking forward to, or fondly remembering back on, the stuff we did/do for fun.
Budget for it. If what you want fits in that budget, and there is no other downside preventing you, then go for it.
You can either embrace the ADHD, or fight it. Ultimately which you prefer is up to you and your individual situation. The downside of embracing it is for sure gonna be financial, the downside of fighting it is gonna be emotional/mental anguish.
Having a new hobby every month can be fine if you know it’s gonna be the thing. Don’t invest too heavily even if it “really feels like this is finally the one”. Or, you can focus on a hobby that does constantly change, videogaming is of course one example. The other thing is, you may develop the ability to steer your interest back to previous hobbies. Just know that there is a bit of a wall to climb to get back into a hobby you dropped, it’s gonna feel a whole lot taller of a wall than it really is but a little push can be enough to clear it without burning out.
Edit: joining a social community for each hobby is a good way to naturally swing your interest back to it every now and then.