How to get the player through a regular script but on a value change?

(This is filtering enabled)

The title is vague, but let me explain:

I want this code to run when a value in the replicatedStorage has changed:

game.Players.PlayerAdded:connect(function(plr)
    if game.ReplicatedStorage.keepTrackOfVariablesPlease.Value == true then
    wait()
    for i = 0, #game.Players:GetChildren(), 1 do
        x = i
    end --counting
    warn("Counting")
    if x >= 1 then
        print(x)
        game.ReplicatedStorage.ValidPlayerCounter:Fire()
        warn("Game can start now!")
        game.ReplicatedStorage.validPlayerCount.Value = true
        game.ReplicatedStorage.canStart.Value = true
    else
        print(x)
        game.ReplicatedStorage.nonValidPlayerCount:Fire()
        game.ReplicatedStorage.validPlayerCount.Value = false
    end
    game.ReplicatedStorage.gameStarted.Changed:connect(function()
    if game.ReplicatedStorage.keepTrackOfVariablesPlease.Value == true then
        if game.ReplicatedStorage.canStart.Value == true then
            local chosen = math.random(1, table.getn(spawners))
            local picked = spawners[chosen]
            plr.Character.UpperTorso.CFrame = CFrame.new(workspace.Teleports:FindFirstChild(picked).Position + Vector3.new(0,3,0))
            game.ReplicatedStorage.stopOn.Value = true
            for i,v in pairs(game.Players:GetChildren()) do
                if v:FindFirstChildWhichIsA("Player") then
                    local thread = Instance.new("BoolValue")
                        thread.Parent = game.Players.Alive
                        thread.Name = plr.Name
                end
            end
        end
    end
    end)
    end
end)

The thing is; that the only way I can get this to work is to put it in the "onPlayerAdded" function, which makes it only run once. I want this to run multiple times, so I was wondering what function I'd put it in and how to get that value of the player?