So on the surface it looks like you simply need to go to Settings > Update & Security > Recovery > Learn how to start fresh with a clean installation of Windows...
That would give you a Windows 10 OS with no personal data. A clean slate.
But here is the important question: Will you keep the laptop or is it destined for someone else?
Issue: the Windows 10 License is tied to
your Microsoft Account. Fine if you want to keep the laptop, not so good if it is going to someone else. You could sign back in to a clean install with your Microsoft Account and it will activate. You cannot leave it at the setup screen and pass the laptop to someone else. The free upgrade period is over, they will not have a License stored in the cloud for
this machine tied to
their Microsoft Account. They would need to purchase Windows 10 outright at this point in time. And you don't want a machine tied to
your Microsoft Account in someone else's hands.
So what is your end game? Keep the laptop? Give it or sell it it to someone else?