How do I revert back to Catalina? Late 2013 iMac

Okay, so I have a Late 2013 21.5-inch iMac that prior to me using OpenCore ra​n Success' href='/2020/12/install-macos-catalina-on-supported-pc.html'>Catalina. I used OpenCore to install Sequoia, and since then it's been very slow for me.

I should also make note that I did go through the post-installation patches. I feel like I messed up my computer and am afraid of potentially bricking it indefinitely. Is there any way I can revert the changed and get it running back to Success' href='/2020/12/install-macos-catalina-on-supported-pc.html'>Catalina?​

Author: @Thin_Comparison_4836