With the current 30-level limit, it is in my opinion too easy to reach the level limit. With the current system, every player has easy access to high-level parts from level 15, and can simply buy the items they need once the reach level 30. If they do not rank up much, they can easily destroy weaker opponents around their rank. Solution:

Increase level limit to 100. It gives players more to aim for, and in combination with matchmaking being based on items it could create much more diversity in builds. If items were 'spread out' over 100 levels instead of 30, players would have to be more active to reach the level they need for an item. This would also reduce the amount of items at each level.

In addition, removing the ability to find level 30 items in level 15 item boxes would make the game fairer as those with high-level equipment, at say, rank 12-13, could not farm opponents at their rank with low-level equipment. As in the old system, where items at a certain level can not be used by lower levels, mythicals are restricted to level 70+ only, as well as being unable to play against any non-mythical users.