50+% probability of winning with 2:1 Risk Reward Ratio

I'm a programmer.

I'd like to develop a simple EA whose probability of winning is above 50% with risk reward ratio of 2:1 at least over a period of 10 years for a given market.

Stop loss is a must. No grid or martingale.

So basically, it could be like sell whenever Stochastics is in Overbought above 85 and price is below EMA50 with target of 100 pips and stop loss of 50 pips for USDCAD.

I can program quickly and the winning idea that helps me complete my EA will get $100.

Only using indicators.

I have developed over 20 many entry and exit strategies combinations but haven't had much success considering the above metrics.