Incrementing attributes in Minecraft

[Pearlaqua]

I want to figure out how to increment a player's health without writing 225 lines of Datapack code. I cannot find any way to do this. I've tried :

execute at @a run execute unless score @p custHealth matches 1 run attribute @p generic.max_health base set Health @p 

but that does not work.

[Laycee]

Try this command (amplifier is no. of hearts)

/effect give @a health_boost

Or for permanent use:

/attribute @a minecraft:generic.max_health base set 2

In this case 2 means 1 heart, so you enter e.g. 60 for 30 hearts.