This Modpack is meant to be a modded minigame to play with a small group. This adventure that you will embark on with your comrades will require you to finish Minecraft but in a little big world, at least that is what it will seem like until you figure out that XP = Growth. There is a data pack that allows this to happen and it can be found in the link below. BUT you do not need to download this because there are ALREADY 2 WORLDS SET UP with the data pack.

Best Options you should consider.
/gamerule keepinventory TRUE {This is very important if you do not want to restart your size and xp level on DEATH}
v {To enable and disable pack} v
/datapack enable "file/minecraft-but-your-experince-is-equal-to-your-height"
/datapack disable "file/minecraft-but-your-experince-is-equal-to-your-height"

Original Datapack. {This was edited in the mod pack inside the two worlds provided to add a better and faster experience}
https://www.planetminecraft.com/data-pack/minecraft-but-your-xp-your-height/

Optifine options: Need to install Opti-Fabric
WARNING: SHADERS DON'T WORK COMPLETELY WITH IMMERSIVE PORTALS MOD
Best Shaders for Modpack
Sildurs Vibrant Shaders Medium

Chocapic13_Ultra

Little Big Craft