Hello,
If you haven't already, please try a Point-in-Time Restore. You can do this by going to the blue screen with the options "Continue", "Use a device", "Troubleshoot", and "Turn off". Select "Troubleshoot" and then selecting "Point-in-time Restore". Select a recent date and then enter your BitLocker recovery key if prompted. Plug your laptop in so that it doesn't die during the restore process and then start the restore process. You should be able to use your laptop again afterwards.
If not, could you please try suspending or turning off BitLocker through the Command Prompt?
To do this, once you are in the blue screen with the options "Continue", "Use a device", "Troubleshoot", and "Turn off", press "Troubleshoot" then "Advanced options" then "Command Prompt". You may choose to enter your BitLocker key here, or skip this drive and continue.
If you didn't enter your BitLocker recovery key already, type manage-bde -unlock C: -rp [48 digits] and press enter. Make sure to replace [48 digits] with your recovery key with the hyphens included. Once it unlocks, type manage-bde -protectors -disable C: -rebootcount 0 to suspend BitLocker indefinitely.
Once it succeeds, type exit and then try Safe Mode.
Please let me know how this goes.