Hello deenterry,
For difficulties with your iPad charging slowly, you'll want to take the steps below:
• Use a different power adapter or a different charging cable. If you don’t have those, contact Apple Support.
• Force restart your iPad:
• For an iPad without a Home button: Press and quickly release the volume button closest to the top button. Press and quickly release the volume button farthest from the top button. Press and hold the top button until your iPad restarts.
• For an iPad with a Home button: Press and hold both the top (or side) button and the Home button until you see the Apple logo.
You can also find those steps in this resource: Fix issues with charging - Apple Support
Should that persist with another cable and power adapter, you'll want to reach out to Apple Support: Apple Support They'll be in the best position to look into this further.
Take care.