Sometimes it's better to just hold a bunch of good coins for months than daytrade (because you can miss huge pump).
So how it is connected to what is being discussed here "leave real job for crypto trading"?
It is not wise to leave your full time job just for trading crypto. As of now it is not stable and unpredictable. Maybe investing needs time but you should not sacrifice your job for it. Its better to keep your job, earn some money, fill in your financial needs and invest your extra money on it.
If you have the funds and the knowledge, I would not classify it as a bad decision. However, the OP could have made a smarter decision which I want to believe he did, by testing his trading skills and how fair it is for him before quitting his job. However, it is a good decision if you have the bucks to trade with as there are lots of opportunities if you know what you are doing.
Even if someone has very great knowledge about crypto trading, it is still not a good decision to leave full time job for crypto. We do not know how long crypto trading exist in this world. No guarantees. Once it is over (but I hope it wont), those who leave their job will regret so much about their decision.