How do i keep the health the same after someone dies?

Well i want to keep the health the same it's the very bottom function i feel like i have to change something i this function can you tell me what? Sorry i didn't word correctly i meant like the health changes everytime they l evel up but then when they die it goes back to 100

game.Players.PlayerAdded:connect(function(player)
	stat = Instance.new("IntValue", player)
	stat.Name = "leaderstats"
	
	Gold = Instance.new("IntValue", stat)
	Gold.Name = "Gold"
	
	Exp = Instance.new("IntValue", stat)
	Exp.Name = "XP"
	
	Level = Instance.new("IntValue", stat)
	Level.Name = "Level"
	Level.Value = 0
	

	xpTotal = 11 * Level.Value
	
	player.leaderstats.XP.Changed:connect(function()
		
		
		if Exp.Value > 11 * Level.Value then
		Level.Value = Level.Value + 1 --add a level
		Exp.Value = Exp.Value - xpTotal --If its greater than five carry over
		
		end
		if Exp.Value == 10 * Level.Value then
			Level.Value = Level.Value + 1 -- add a level
			Exp.Value = 0 --if it = 4 then Send exp to zero
	end
	end)
	player.leaderstats.Level.Changed:connect(function()
			playa = player.Character or player.CharacterAdded:wait()
			playa.Humanoid.MaxHealth = Level.Value * 10 + 100
			playa.Humanoid.Health = playa.Humanoid.MaxHealth
	end)
end)

You need to do that in CharacterAdded. Enter this between Lines 35 and 36:

    player.CharacterAdded:connect(function(character)
        wait() --Not 100% sure of how temperamental Roblox is when a character respawns. Just in case.
        character:WaitForChild("Humanoid").MaxHealth = level.Value * 10 + 100
        character.Humanoid.Health = character.Humanoid.MaxHealth
    end)

Like the other answers have shown, we must set the now hp when the characters spawns. CharacterAdded

Here is a quick example:-

-- create instances quickly
local function mkIns(insType, par, name)
	local tmp = Instance.new(insType, par)
	tmp.Name = name
	return tmp
end

game.Players.PlayerAdded:connect(function(plr)
	local stat = mkIns("IntValue", plr, 'leaderstats')
	
   	mkIns('IntValue', stat, 'Gold')
	local xp = mkIns('IntValue', stat, 'XP')
	local level = mkIns('IntValue', stat, 'Level')
	
	-- this will be 0 ??? so why are you doing this
    --xpTotal = 11 * Level.Value
	
		-- connect the event to the object we do not need to go to the player we have the object use it
	 xp.Changed:connect(function(newValue)
		if newValue > 11 * level.Value then
        	level.Value = level.Value + 1 --add a level
        	xp.Value = xp.Value - (11 * level.Value) 
		elseif xp.Value == 10 * level.Value then
            level.Value = level.Value + 1 -- add a level
            xp.Value = 0 --if it = 4 then Send exp to zero
        end
	end)
	
	-- add the changed event to the level but we could also do this within the xp changed as we know when the plr levels up
	level.Changed:connect(function(newValue)
		
		-- update plr hp
		local plrModel = game.Workspace:FindFirstChild(plr.Name)
		if plrModel then
			local hum = plrModel:FindFirstChild('Humanoid')
			if hum then
				hum.MaxHealth = level.Value * 10 + 100
				hum.Health = level.Value * 10 + 100
			end
		end
	end)
	
	-- gives the player the hp when they join the game
	plr.CharacterAdded:connect(function(plrModel)
		local hum = plrModel:WaitForChild('Humanoid') -- wait for the humanoid
		hum.MaxHealth = level.Value * 10 + 100
		hum.Health = level.Value * 10 + 100
	end)
end)

This is only an example, please comment if you do not understand how / why this code works but first check the wiki.