Honestly, I think the way to do it is with a team of people.very challenging for one individual to do alone.ironically, most seem to not be able to do it alone, and most also seem unwilling to try it with a team.
there are many levels of profitability......that has to be decided individually. in my 30 years experience you are the first i have heard who has achieved profitability in 2 years. that is a fantastic achievement
Probably quickly found edge, quickly lost edge. It took me about 10 years, but 10 years later it still works. I learned to play football in 24 hours... but was never good enough to play in any competition.
ironically, most seem to not be able to I've seen plenty do it more quickly...and few who try longer.