Why doesn't my leader board script work after a player dies?

I am a beginning scripter and I am working on this leader board script, and I want it to reset the TimeAlive value to zero every time a person dies, but also convert that number into XP by dividing it by ten. When I test the script on the server, the TimeAlive value continues to go up, even after death, and it never resets or converts to xp. I tried a debounce also, which is the alive variable, but that didn't work either. I am kind of stuck, so please help!

--script by Legobrain9275--

local alive = true


game.Players.PlayerAdded:connect(function(player)
	stats = Instance.new("IntValue", player)
	stats.Name = "leaderstats"
	
	timealive = Instance.new("IntValue", stats)
	timealive.Name = "TimeAlive"
	
	xp = Instance.new("IntValue", stats)
	xp.Name = "XP"
	
	level = Instance.new("IntValue", stats)
	level.Name = "Level"
	
	while alive == true do
		wait(1)
		player.leaderstats.TimeAlive.Value = player.leaderstats.TimeAlive.Value + 1
	end
	
	game.Players.PlayerAdded:connect(function(b)
		b.Character:WaitForChild("Humanoid").Died:connect(function()
			alive = false
			b.Character:GetPlayerFromCharacter(c)
			c.leaderstats.XP.Value = (c.leaderstats.XP.Value + (c.leaderstats.TimeAlive.Value/10))
			c.leaderstats.TimeAlive.Value = 0
			alive = true
		end)
	end)
	
	if player.leaderstats.XP.Value >= 1000 then
		player.leaderstats.Level.Value = player.leaderstats.Level.Value + 1
		player.leaderstats.XP.Value = 0
	end
end)

Your script never makes it past line 22.

    while alive == true do --This script goes on forever, and never allows you to move on
        wait(1)
        player.leaderstats.TimeAlive.Value = player.leaderstats.TimeAlive.Value + 1
    end

In order to allow the script to go past that loop, you can use a spawn() function to execute the loop on another thread.

spawn( function()
    while alive == true do --This script goes on forever, and never allows you to move on
        wait(1)
        player.leaderstats.TimeAlive.Value = player.leaderstats.TimeAlive.Value + 1
    end
end)

Also, on line 24, I believe you were trying to connect to the event player.CharacterAdded . List of Player events here.

Also, a few other things.

Line 18 while alive == true do will run as long as the player is alive, however, once the player dies, it will stop running.

Also, b.Character:GetPlayerFromCharacter(c)doesn't make sense, because we already have the player defined as player.

Additionally, on line 34, this code: if player.leaderstats.XP.Value >= 1000 then only runs once.

And, instead of using a Humaniod.Died event, we could use CharacterRemoving

--script by Legobrain9275--

local alive = true


game.Players.PlayerAdded:connect(function(player)
    stats = Instance.new("IntValue", player)
    stats.Name = "leaderstats"

    timealive = Instance.new("IntValue", stats)
    timealive.Name = "TimeAlive"

    xp = Instance.new("IntValue", stats)
    xp.Name = "XP"

    level = Instance.new("IntValue", stats)
    level.Name = "Level"

    spawn( function()
        while true do
            wait(1)
            if alive then
                player.leaderstats.TimeAlive.Value = player.leaderstats.TimeAlive.Value + 1

                if player.leaderstats.XP.Value >= 1000 then
                    
                    player.leaderstats.Level.Value = player.leaderstats.Level.Value + 1

                    player.leaderstats.XP.Value = 0
                end

            end
        end
    end)

    player.CharacterAdded:connect(function(b)
        alive = true
    end)

    player.CharacterRemoving:connect(function(b)
        alive = false
        player.leaderstats.XP.Value = (player.leaderstats.XP.Value + (player.leaderstats.TimeAlive.Value/10))
        player.leaderstats.TimeAlive.Value = 0
    end)


end)