how do I recover my data from my phone if erased due to forgot pin code

As you have learned, if you have forgotten your passcode, then you have to reset the passcode. This process erases all data on the iPhone in the reset process.

Hopefully, you have a backup created on 👉 iCloud and/or on a computer. If you do then, you can 👉 Restore your iPhone from the backup file once your passcode has been reset and the iPhone has been returned to factory settings by the procedure in the link above.

Axel F.