Im getting crazy

Im using a 15inch MacBook Pro from late 2011 And I thought that downloading OpenCore legacy patcher was a great idea (it was not) So after downloading macOS Monterey my MacBook Pro was very very slow lagging freezing and all that and I tried cmd+r but it put me on the recovery mode of OpenCore and i am now stuck with this and I tried to change the stockage I upgraded from a hdd to a ssd and it still does the same thing so I want to go back to macOS High Sierra because my Mac was fast and responsive so if anyone can help me I’ll be very happy to listen to you

Author: @PineappleAble6280