Sequoia -monterey downgrade problems

2015 8gb MBP- wasn't happy with Sequoia performance so I tried to downgrade & now I got this 😭😭😭

Idk what to do st this point. Somebody suggested a downgrade but OCLP isn't super straightforward on downgrading to me so I follow a YT video

I made the Bootable usb in monterey & did the terminal thing, erased hard drive & installed monterey & now I'm here. Is it fixable? What should I do?

I shoulda just stayed with big sur that it came with lmfao