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buy the top 20 Losers similar too a mean reversion

I want to buy the top 20 Losers at close on FRIDAY. (Use the Finviz top losers but I think it's just the worst stocks of the last 24 hours)
Then hold the positions for a week to a month pending results.

I was playing around with the mean reversion below but was hopeing someone could help me.

I am not even close to getting what I want with this backtest but it's a starting ground