If [0] those returns are accurate, can be proven, and your strategy can be scaled up to multi-million dollar positions, you should take it to a hedge fund/prop shop/etc. and be able to make 7 or 8 figures. Your bonus should be dependent on performance; you may be able to negotiate a % of the profit. Those companies don't care about your background if at the end of the day you make them money.
Short of spending a million dollars right then and there, you can use historical market data. Or datasets provided by the person you're trying to prove it to. Keep in mind that after a certain volume, your model would start influencing the market itself.
[0] Granted, that's a huge "if".