Balanced Enchanting Mod (1.16.5) allows you to enchant and use the anvil at higher levels for the same amount of points.
Vanilla Minecraft has a fixed cost for enchanting tools/armor. This is regardless of your level. It will cost you 3 levels to enchant a max-level item in the enchanting tables, no matter if your level is 30 or 300. However, the amount of xp needed to gain a level increases linearly. Therefore, an enchantment costing the same at level 300 will cost 50x as at level 30. The mod allows enchantments or anvil operations to be made at any level for the same fixed price. This mod does not require registry replacements.