Hello there,
Have you checked your Microsoft account for the Bitlocer key?
If your device is a modern device that meets certain requirements to automatically enable device encryption, your BitLocker recovery key is automatically saved to your Microsoft account before protection is activated.
You can try to recover them by following these articles.
Finding your BitLocker recovery key in Windows
https://support.microsoft.com/en-us/windows/finding-your-bitlocker-recovery-key-in-windows-6b71ad27-0b89-ea08-f143-056f5ab347d6
BitLocker recovery guide
https://learn.microsoft.com/en-us/windows/security/information-protection/bitlocker/bitlocker-recovery-guide-plan
You can also try to disable the secure boot in the UEFI and try logging into your device.
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