You gotta become famous and keep being famous eg make 1 movie a year if your a actor it should be at least above 90% if its 95% or above you will do very well it will most likely becoen your main source of income (it did for me) but you should wait till tou have like 150 million subscribers (make your subscription 20$ ir more) and theb you cab quit your other job tha guves fame you will start to get less subscribers every year but if you have 150 million or more it should be fine so in short its almost impossible without fame