Better ways to level up/ get XP

I think getting XP and leveling up gets verrrrry tedious after like level 10, since the higher your level, the less XP gives you towards your levels. So I think that either you should lower or even flat out remove the fact XP gives less and less after each level, OR for my big idea; A new enchantment.

I think there should be a new enchantment that goes on weapons like the sword, spear, axe, etc. The enchantment should be called "Extraction" or something along those lines. It'll basically make it so you get more XP from killing mobs (except for maybe like the ender dragon or something, but there's also a reason that might not need to be the case). And it'll come in other levels, at least up to 2 or maybe 3, and the higher the level, the more XP you get.

BUT, i think the only way you can get it would be in End Cities so its kinda like an end game thing (especially if theres ever an end update so this would be perfect to add to that), AND it only comes in level one when you find it so you'd have to find multiple and combine them so its a bit more balanced. Maybe it could cost more to combine them since it would be really worth it. Or perhaps make it so if you have Extraction on, you can't put on looting or something like that, so it's reeeeally balanced.

Maybe, since it would definitely be such a sought-after item, you could make a little chamber in end cities with one of these books in an item frame, kinda like the elytra. 

Hopefully something like this gets added in the future!!!