Is it good to leave my job to dedicate myself to full-time cryptocurrency?
No, as you are starting you will experience a lot of situations were you will feel overly happy and overly depressed, without a steady income, you may end up homeless.
As an advice, start to build experience and strategy, once you have a working routine on how you gain money and once your crypto gains exceed your salary by a huge amount, then you may start to plan your retirement. PLAN it first before committing, good luck.