You say you are 41 and have been at those for 41 years? Did you start studying charts as a fetus? How was kindergarten when you started automating your systems. Typical ET bullshit logorrhea
As far as how much a system can trade as far as shares or volume of funds, am sure others have made formulas of being a percentage of daily volume. But at that stage, I would think one would be using dark pools instead of going retail. Wouldn't want those who can push the market based on what you are showing of volume beyond the limits of what you want to pay. @Aquarians you might find after a year of real time, system too good to sell, this has often happened to me and I kept to myself. If you keep drawdows low and still make 20-30%, after few years, easier to market yourself. Good luck.