If your drive is encrypted with Bitlocker, the only place the Bitlocker Recovery key is automatically stored is on the associated Microsoft account on the link below, be sure to check any Microsoft account that may have been used on the PC and also any work or school account that may be linked to the PC.
https://account.microsoft.com/devices/recoverykey
Are you able to find the Bitlocker Recovery Key on any account that may have been used or linked to the laptop?
If not, do you have a safe backup of your files from the C drive, or use a cloud service like OneDrive to sync your files online.
If you are unable to find the Bitlocker Recovery Key on any account that may have been used on that device, then I am sorry for the bad news, the only way to access that device is to create a bootable Windows 11 USB on another working PC and use that to clean install Windows and at the start of the installation, delete all partitions on the drive that is encrypted to remove the encryption, which will sadly result in loss of all data on the drive.