About the standard optimization and forward optimization

 

I did the optimization in the period of 201901to 202101

and I forward tested in half like 201901-202001 and 202001-202101. 

And the result in  201901-202001  was good , but  202001-202101, the result was bad. 

And I did the forward optimization for  202001-202101, and I found the profitable value for stoploss and takeprofit. 

But the profitable value is different from the profitable value for   201901-202001

For example, the profitable value in  201901-202001 is 170 and 240, the profitable value for  202001-202101 is 125 and 185. 

In this c case, which value I should set to the ea? 

 
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