Unbootable after OCLP install.. please help!

Hello!

I have iMac 27 (late 2015) with latest macOS Monterey installed and decide to install Sonoma via OCLP (I wish I didn't). I downloaded latest version of both and did everything manual on the their website said.

After several reboots I got stuck with Install Sonoma, but now it doesn't recognise my internal SSD! If I reboot without USB I get black screen error. Disk Utility sees my SSD, but it's not mounted and I can't mount it and continue installation! I read tons of info here and found only one solution to reset SMC and PRAM. It did nothing, system doesn't let me mount my old SSD (I have only one). I did full Time Machine backup on my Time Capsule, but I can't access it too wifi not working with that OCLP usb. I have tons of important data on my SSD, I can't erase it, I need to get back to Monterey again. What should I do? If I do Monterey USB bootable installation will it fix everything back and I should be able to install it again?

Please help!