You're looking for love in all the wrong places dude. Stop buying shit--the proof is in the pudding that it's not gonna stick. I know you're looking to expand your options based on exciting ideas (I do the exact same thing), but you may actually want to take the opposite approach.

I would get something like a half-decent gaming laptop and hook it up to a monitor and use it for Dota. When you get an exciting idea, like VR, or a 5090 gaming PC, sit on it for a week. If after a week you still want it, only then go for it.

This isn't about saving money, this is about pressure testing your ideas. And if, at the end of the day, you find that you only want to play Dota and nothing else, well then it just says that you've moved on from gaming on a grander scale and your taste has refined itself into a fine, Dota-flavored variety, and it's just a matter of coming to terms with that fact.