it is wise to have multiple source of income, no need to leave your work unless you have a 80% win rate from 100 trades. Also dont stick with a single exchange site
Having two sources of income, one of which is trading and the other is your main job, will not work either. You won't be able to trade properly with your main job. It's another matter if you just invest in cryptocurrencies for some part of your salary. It is more likely to be a win-win scenario in the future. 80% of successful trades are fantastic. It's impossible in the long term.