Hi! Good day , Jerry here, an independent advisor. Here to help you.
May I ask if you already have tried to check https://account.microsoft.com/devices/recoverykey then sign-in to your account, from there you should be able to see you available bitlocker recovery key.
You may also refer to this article below.
https://support.microsoft.com/windows/finding-y...
If none of this is helped, then the you will not be able to recover your files anymore as theres no other workaround for this without using the recovery key.