Increase the value of specific enchantment

I'm working on a mod that adds the ability to increase the level of enchantments, and I've got it to work but I have to have a block of procedures for every increase in level for each enchantment i.e checking enchantment level of 5, removing enchantment, then setting enchantment to 6

https://imgur.com/a/KxwGhf6

I also tried using NBT values but it didn't work

https://imgur.com/iQWF4Np

Does anyone know an easier way with procedures or the proper code to increase the value of a specific enchantment on an item