I know of editing the build height via datapack in 1.17+. But I was wondering if there was any way of having terralith generate terrain to the parameters I've set beyond vanilla limits?
There isn't an easy way to do this. Thankfully, if you like really tall mountains, and enjoy your computer blowing up, there is a datapack just for that. Because it is so unstable, it is not released publically, and only available to Patrons, Supporters, Donators, and Server Boosters.
topaz dust
sonic pulsar
fallen musk