You earn 60k/year, the average American income
You work 5 days a week, 50 weeks a year - 250 days
60k/250 days = $240
When you break it down like that, replacing it becomes achievable in your mind. That mindset is way more important than the number above.
The second thing you need before you go full time is a solid plan.
That plan should include saving enough money to not have to stress about the day to day expenses.
It should also detail the minimum amount of profit you need to earn so that you can both live the lifestyle you want to live, and to keep growing your stack.
you are forgetting something, you can't make it to work without initial capital
if you're aiming for $240/day and assuming this is 1%/day profit (30%/month)
then you will be needing $24,000 as initial capital to achieve your daily target
if you do have that much fund ready and can make your plan to actually work out,
you still have to face the possibility of losing your profit and capital in the single event of deep crash
are you ready for all that risk vs profit situation?
be a full time trader with possible high income/profit that comes with considerably high risk
or just work full time, get a steady paycheck that you can save or place in a long term investment