is that possible to do with an datapack?
when yes how i should do it
#Level system like hypixel Skyblock
stone edge
brazen violet
chrome pike
You might want to read the rules again. Try some stuff yourself and ask a specific question on something that you don't understand or can't get to work.
It is possible to do skill systems etc., but not everything mods/plugins do is possible with datapacks.
TL;DR; Yes, with a varying degree of success and yet sometimes no. Ask a more specific question.