The most affordable option for higher education aka college/university degrees I know of are a new thing called micro degrees offered on sites like these:

https://www.coursera.org
https://www.udacity.com

Micro degrees used to cost around $50 for the certificate. I can't comment on how useful the degrees are in finding a job, I've never undergone the process. I've done some of the free courses for fun and they seem like they're good.

To support yourself trading crypto, you would need to trade in massive sums. And you would need to be perfect. From a statistical perspective, its impossible, here's why. Let's say the average price movement of bitcoin is around 8.6% per day moving from 13000 to 15000 or the opposite. That gives you a maximum potential profit of 8.6% per day without factoring in losses and mistakes which cause you to profit only a fraction of total price movements.

When you do the math and break down the problem, it becomes more difficult. Especially over the long term where consistency is key. Suffice it to say you would probably need $10,000 minimum to trade. Then you would need to profit enough of a percent on that $10k to pay your bills. Of course, there would be some days where you lost money instead of making money.

If you want to get an idea of how much you can make trading, take a small sum like say $20 and see what percentage of that you can profit over a week/month. That will give you an idea of whether its feasible without having to make any long term commitments or risk more than you can afford to lose.