It is possible, but only if you have the necessary skills. But I don't recommend you completely abandon official work. No one knows what will happen with bitcoin in the future. You risk to remain without money and pensions. You will agree with me it is very risky.
Maybe combining a job and earning in bitcoin is much better .if you want a higher income you must have a job and bitcoin because we cannot say if bitcoin is stable so that if you have a job you have an income that stable to pay all you expenses.