How To Properly Backtest Multi Pair Grid Strategy

Hello! I'd like to get a quote from you. I want to build a simple Expert Advisor that does martingale hedging like in the attached picture, but that allows me to specify the price zone and exits in points. I would like to be able to manually open the first trade with whatever lot size I choose at market price and have the following trades/orders be opened automatically with lot sizes according to the multiplier set

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