Your TV model is not compatible with either the Apple TV App or Airplay 2 unfortunately, however you still have several options:
Use a Digital AV Adapter and an HDMI cable to physically connect the iPad to the Apple TV.
For the 2018 or later iPad Pro Models with a USB-C port: USB-C Digital AV Multiport Adapter - Apple
For the 2015 to 2017 iPad Pro models with a Lightning port: Lightning Digital AV Adapter - Lightning to HDMI - Apple
Get an Apple TV and use the included TV App instead of your iPad: Apple TV 4K - Apple
Get a Roku, Fire TV Stick or other streaming device that supports the Apple TV App: Apple TV app - Devices - Apple