My iPad Pro cannot find the Apple Pencil 2

I was using my Apple Pencil 2 normally then I realized it was not charging (it was at 70%, my iPad was connecting to the pencil).

Then I went to Settings/ Bluetooth and Forget this device to try to fix the problem. But, after that, my iPad is not able to find the Apple Pencil 2, it doesn’t appear in the Others Devices list, with the pencil adhered to the side of the iPad.

I tried several ways introduced, reset my iPad, reset all Settings. They were all in vain.

Please help!

some info of my iPad:

• iPad Pro 11 inch gen 2
• padOs 14.4
• bought 5 months ago