I don't think that's true. Retail traders have a whole collection of qualitative edges that are not accessible to the institutional traders/PMs (e.g. myself). The structural advantages of being in retail probably deserve a separate thread, but the main obstacle retail traders are facing is lack of education/knowledge and shortage of experience.
The OP is probably right in using risk premia as the base of his strategy. Longer time frame and higher risk tolerance are good advantages to use. He might be carrying too much risk. I have not read enough of the thread to judge the details. If he's smart, he will figure these things before its too late. If he's not, well, he will learn from his own mistakes.
I think I have asked these questions before, but OP was too enamored with his performance at the time.
-- what is your whipeout/MT-loss matrix - that is, what combinations of delta and vol move will take you out of the strategy?
-- what assumptions do you make in that calculation? E.g. do you only assume an overnight move etc.
-- does your strategy employ any analysis of the vol you are selling? No need to detail, just a yes/no.
-- what do you think is the reason why your strategy works? Again, no need to details, just explain who's lunch are your eating.
PS. I do think the OP is on the right track and there is a pot of gold out there.