Can’t find mistakes in the code most probably the mistake is in the concept
i just ran some statistics and found out the following:

11.6% are exited on the second day due to the index filter switching OFF
these trades caused -15.57% profit

21% of the trades were exited within 4 days from the entry and caused -37.6% profit

using 20/10 for trailing stop didn’t solve the problem

I would have to try it

The easy way is bar replay and you will see.

If you see the line is pointing up and then after one bar it repaints to show that it is pointing down since few bars then it can’t be used for system

Honestly what I am using is not far from this almost same concept but I am using channel that represents 20% of the peaks and bottoms so when the close cross it the signal.

In this case I mean the code that you pointed to you can use the slope of the line to know where you are and three points comparison to find tops and bottoms

Three point comparison is like this
Bot = valuewhen line > Ref line ,-1 and Ref line -1 < Ref line -2