Hello,
If you have signed into any work or school accounts on your PC, try logging into those. Windows does a wonky job saving BitLocker recovery keys to a specific account and it's important to check to make sure that the correct account is searched.
It's very unfortunate, but if you've searched in all the Microsoft accounts that you have signed into on your laptop and the key isn't there, or it's not on a USB drive or a printout, you might have to reset your laptop.
I hope this information helps.