OpenCore is gone, now boots only into Windows

Hello y'all!

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I've had a Hackintosh for about 3 months now and decided to update from Catalina 10.15.7 to Big Sur. However, that didn't happen as planned! In short, this is what happened.

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1. I allowed the computer to restart to continue with the install/update.
2. I hit into the "Rooting from the live fs of a sealed volume..." kernel panic.
3. To fix that, I tried updating OpenCore by dragging and dropping the new OpenCore.efi, OpenRuntime, and BOOTx64.efi to the proper locations.
4. Computer now boots to OpenCore crashing, with "OC: Failed to load configuration!"
5. I then tried to fix this by updating the config.plist while the EFI partition was mounted (edited from the windows partition.).
6. Where I am now! Now OpenCore doesn't even show up and instead uses Windows Boot Manager to boot directly into windows.

I messed up big time it seems, is there any way to salvage this? I still have the original OpenCore USB in case I can fix it via that.

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Original PC: Dell XPS-8700

CPU: Intel i5-4440 (Haswell)

SSD: PNY CS900 240GB

OpenCore version: 0.6.2(IIRC), (attempted to) update to 0.6.5

OS: Windows 10 and macOS 10.15.7 -> Big Sur