Skillage

Dive into Minecraft like never before with the Experience Skill Mastery modpack! Gain experience to unlock skills tailored to your playstyle, whether you’re mining, casting spells, or battling foes. Customize your adventure and become a true master of your craft

This modpack is designed for an anarchy server in which the main way to gain power is to convert levels into upgrade points which you can use on the skilltree (opened by pressing o) and chosing a class eg blacksmith  and using the upgrade points to unlock abilities such as: crafted weapons deal 1 more attack.

There is ars nouveau and its addons such as ars creo, ars instrumentum, ars omega, and ars elemental                  All improving the experience

The rest are QoL mods that still make a huge change altogether