Caves and Cliffs is here! With your choice of Tech Reborn or Industrial Revolution combined with a touch of decoration and worldgen, enjoy a refreshing experience on the latest modded platform. Contains all optimization mods as of 2021-06-29 (even Sodium), with more to be added as they are released*.
* - If I remember
Just note that as a pack released less than a week after the Minecraft update itself, it's probably pretty unstable. I did enough testing to verify that the game doesn't immediately crash, but not much more. At the moment, there's probably issues hiding around various corners. It should be pretty stable by now.

