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How to overcome overfitting

There are 5 parameters in the trading model. After optimizing the parameters with MQL5 cloud network , the performance is very good in the sample, but the performance outside the sample is very general. Is there a way to overcome the over-fitting

MQL5 cloud does not work over one week

MQL 5 cloud service can not work since last week,I charge 200 dollars ,and now i need it to work seriously,what is the problem