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Buy and sell orders do not work for BTCUSD

I have a robot in MQL5 that I use to trade assets on the Brazilian stock exchange. The robot works perfectly for opening buy and sell orders, but when testing it with BTCUSD, it fails on the sell orders. Looking at the logs in the Experts tab, it seems that the values are correct, and I don't

How to customize fibonacci projection values ?

I'm learning about mql5 programming and I'm trying to make a function that identifies minimum and maximum prices and adds Fibonacci. I managed to insert fibonacci in the chart but I don't know how to customize the values after 100 and before 0 (yes, I want to put negative values!). I tried several