Many texture packs for Minecraft are available on the internet. A ton of these are old, but are regularly updated as the game comes out with new versions.

Beyond those six worlds, there's also the Razzleberries RTX Texture Showcase by – you guessed it – Razzleberries, which will allow you to test out texture packs.

Likewise, if you'd rather keep using your RTX textures pack, you can do just that. Mojang isn't removing RTX options or the ability to use your own custom texture packs from the game.