Help! Unable to Load MacOS without USB drive

Hello All! I have a Mac Pro 5,1 that’s using a unflashed Radeon RX 580 GPU.

I’ve installed Monterey with OpenCore, created the EFI Mount (moved opencore from usb to macOS drive), but since I can’t access the picker screen (hold ‘Options’ key after startup), it keeps booting into USB drive. It doesn’t even failover to my MacOS.

What do I do?