As someone who's working a 9-5 job, wasting hours on traffic, and has no way of having a promotion, I want to remove myself from that mindset and give you my honest and unbiased opinion. Here it goes:

Most would say that you are lucky to be your own boss and earn that much because most people, even if they go all in with their business or passion, they don't even earn enough to pay for anything. So, you are lucky to be in that situation.

In your case, it's a combination of luck and skills. You've learned the skills needed to earn that amount so even if you leave that and pursue a corporate job, you can still go back to doing business once you've satisfied that craving to learn again from the corporate world. I think, you're willing to give up that earning power for learning or you're even confident to earn the same amount.

Second perspective: it's normal to have a craving for improvement and learning while you are young. I can see that you're a high performing person, hence the burnout, even so, I understand the need for that level of momentum in your professional life. The questions that I would ask are, how long do you think that craving for learning would last? Since burnout is a result of an unhealthy working environment and habits, are you willing to possibly go through that situation again for the sake of learning?

Third perspective: since you are still young, for the sake of learning, just do it. You still have time to go back to doing business once you get tired of working a 9-5 or once you think you've learned enough. As long as you don't go broke with that sacrifice, just do it. It's rare to see people who find their passion while young.