A simple and free Expert Advisor based on the “Oscillator of CCI” indicator and Martingale. It is designed primarily for the GBP/USD M5 currency pair, but it can also work on other pairs if you choose the appropriate parameters.

Testing for the last year: GBP/USD M5

Initial balance = $10,000 

Net profit = $2,355

Drawdown = 2%

To change the lot size, change the parameters “Amount for a new position”, as well as” Amount to add on addition”, which by default have the values of 0.05 lots.