Depends what you use Kodi for. If it’s for accessing media files on a network drive, Infuse is the “gold standard” media player for the AppleTV.

It’s not free, though. But it’s far more stable and nicer to use than Kodi ever was in my experience. I ran Kodi for my home theatre for years but switched to AppleTV+Infuse and never looked back.

For free (and open source!) options you can use the Swiftfin tvOS app and a Jellyfin media server.