I installed MacOS Big Sur and can’t mount

I have tried mounting with opencore and clover, 🍀 they both said mounted and I could open the partition but when I shut the pc down and unplugged the usb it said: “no bootable device found plug it in and restart the device” (I’m an extreme noob in this any help or tips?) thanks 🙏

submitted by /u/SomeTechnicalDiffs
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