The current level system is fine, but a little bit boring. At the moment it is just a number - why not create some kind of reward system for levelling up.
Some examples could be:
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Similar to the hypixel system where you have prestiges as you level up.
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Or maybe some free cosmetics that show your level/ level milestones.
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A public level leaderboard
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Some kind of free battle pass that gives you rewards for leveling up