One of the many features that came along with iOS 13 and macOS Catalina is Sidecar, the ability to connect your iPad to your Mac as a second display, one that supports touch and Apple Pencil.
Have you heard about Sidecar, but not yet given it a try? Check out the linked doc, Apple’s detailed, but easy-to-follow Sidecar overview and set-up instructions.
If you’ve updated to Catalina, do give this a try. It’s kind of cool.