5th gen Pro falls under the M chip series so really no need to upgrade (not many changes) unless you want a bigger screen.
https://www.apple.com/ipad/compare/?modelList=ipad-pro-12-9-4th-gen,ipad-pro-12-9-5th-gen
https://www.apple.com/ipad/compare/?modelList=ipad-pro-12-9-4th-gen,ipad-pro-12-9-5th-gen
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Here’s the new Air vs your Pro
https://www.apple.com/ipad/compare/?modelList=ipad-air-13-m2,ipad-pro-12-9-5th-gen