This behavior pack uses scoreboards to detect player experience levels. Experience levels are not lost after dying and remain upon respawn.

Add the Keep Levels Add-on to your behavior packs on your world. Behavior packs disable achievements, but editing the world with an NBT editor can re-enable achievements when uploading your world to a realm.

Re-enable achievements on either pc or mobile with the free NBT editor Dovetail

The pack is ready to work after adding to your world. If a player dies, they keep their levels, just like with /gamerule keepinventory true but still lose their inventory.

You can display a player's levels by setting the scoreboard display.

/scoreboard objectives setdisplay sidebar xp_level

Removing levels from a player, like in an NPC Shop or using abilities, will make the score go down. However, removing scores from xp_level will not remove experience levels.

/xp -10L @p` \\ Scoreboard objective xp_level goes down.

It works functionally the same as the target selectors l and lm. The examples below do the same thing.

/execute as @a[lm=10, l=15] run effect @s strength 0 1 true

/execute as @a[scores={xp_level=10..15}] run effect @s strength 0 1 true

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