Does the day-trading working can replace a regular job?
Day trading is what you do with the money you get from your job. It doesn't replace it.
I work for a FCM. Most profitable "day traders" are of retirement age and don't make quite enough gains to live off of. I assume they just trade for a hobby but don't quote me. The accounts that make >6 figures are literally 1 in 100,000, at least of the accounts for our brokerage.
10 to 1 OP is an Indian and posted in earnest