I haven't heard of someone who left their job because of bitcoin. But there are people who can focus on bitcoin and their jobs at the same time. I think if you want to focus try to manage your time and learn more about bitcoin.
I guess I have read somewhere in forum and also one of them is op as he decides and wants to pursue his goal with working full time in bitcoin. If you are focused with bitcoin, it's very easy to manage your time because you are working at your own convenience while staying on your home. But this needs a lot of thinking.
Not only thinking but will also require great level of skills and knowledge about the crypto world and if you don't have enough knowledge about it then never take a risk of getting full time in bitcoins by quitting your job as if you are a full timer in bitcoins then you also need to discover the multiple ways of earning bitcoins then only you can afford to get full time into it.