Trading is more difficult than investing and quiting a job that is a main source of income for the sake of trading can be seen as foolishness. There is no need for a trader to quit his job because of trading, the best thing to do is to trade alonh side after working for the day. Even if making profits is not a problem, there should be a level of success a trader can reach before ever quitting his job.
Even if making a profit is not the issue, or you have already had some real success in your trading journey. Quitting your job to pursue a fulltime trading career is also a bad idea.
Because in reality, no one truly control the market. Just because you made a profit in the past does not mean you will keep doing it going forward. The market is constantly changing, and nothing is certain.
Not to mention, your psychology will be completely different when trading become your only source of income. At that time, your decision will be influenced more by emotions and pressure rather than logic. So, I would never endorse this idea, no matter how good your track record is or how confident you feel.