(Note: I know there are some suggestions already requesting this. I'm not stealing these ideas.

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With the new decreased XP requirements, reaching level 30 now costs the same as it did in the old 150-level system (around 44k XP). While this helps new players earn tokens and level up quicker, it is, in my opinion, much too easy to reach the level cap and have access to everything in the game. The underlying problem here is that all of the game's content is packed into 5-6 days' worth of play. Increasing the level cap to 50 or 100 and removing the ability to use items of a higher level than your own would fix this, by 'spreading' items out over more levels, therefore requiring players to play for longer to find more powerful items. Mythicals should also be limited to players who have reached, for example, level 70 or higher.
Removing the ability to use items higher than your own level would also help spread content out evenly, however the problem here is that existing players with higher level items would have an advantage. To fix this, the game would check players' levels in comparison to their items, and if any items have a higher level requirement, they are locked until the player reaches the required level. Equipped higher level items would be unequipped and then locked.