apple pencil is connected but wont draw

First, check that the Pencil tip is firmly screwed-on to the Pencil.

Here is one of the better fault-finding guides:

https://appletoolbox.com/apple-pencil-not-working-heres-our-troubleshooting-guide/

If you’re unable to resolve the problem using the linked guide, you might be best advised to directly contact Apple Support for assistance. During these troubled times, the quickest way to engage with Apple is to use the Contact Support link at top-right of this page.

Do let us know how you get on.

Yes. Only first, not second gen

You can use Apple Pencil (1st generation) with these iPad models:

• iPad Pro 12.9-inch (1st or 2nd generation)
• iPad Pro 10.5-inch
• iPad Pro 9.7-inch
• iPad Air (3rd generation)
• iPad (7th generation)
• iPad (6th generation)
• iPad mini (5th generation)

Yes. Your iPad7 is compatible with the first generation Apple Pencil.

The first generation Pencil has a Lightning connector for both charging and pairing with the iPad - whilst the second generation Pencil uses a magnetic/inductive coupling to the edge of the iPad.