This is a datapack which adds a RPG style levelling system, which allows you to level up certain aspects of your character
Each stat can be levelled up infinitely, but by default it is capped at 100 Levels. You can change this with:
/scoreboard players set aolu_psp_max_lv aolu_psp_const MAX_LEVEL
See your stat levels and XP with:
/trigger aolu_psp_stats
Uninstall with
/function aolu_plr_stat_prog:uninstall
!The player's Stats, Levels and XP for each listed in the chat
Hovering your mouse over a skill tells you information about it!
Additionally, this Datapack tweaks crossbows a little bit.
They have gained 30% more arrow velocity (since arrow damage is also tied to velocity), giving them a more long-range, high-damage niche.
However, each level of quick charge multiplies it by -15% per level.
Benefits for each level in each stat:

Level up different attributes of your player through Gameplay!