How do I add a data store to a leaderboard I made previously?

I am trying to add a data store to my leaderstats so the amount of points and survivals a player makes is saved so that when they join again they have the same number of points and wins as I have a shop GUI where you can buy stuff using the points. In addition, I want the players to have the gear they buy in the game to be with them when they join.

I tried to make a datastore on a separate script in the workspace but when I join my game a leaderboard comes up but it isn't the leaderboard I made previously as a player isn't receiving points when they survive on the new leaderboard.How do I make a datastore for my existing leaderboard?

This is the code for my leaderboard:

bin = script.Parent



---------- For Announcing Who Survived
feedbackEnabled = true
function feedback(parent, message)
    if not feedbackEnabled then return end
    local h = parent:findFirstChild("announcement")
    if h ~= nil then
        h.Text = message
    else
        h = Instance.new("Message")
        h.Name = "announcement"
        h.Text = message
        h.Parent = parent
    end
end

function removeFeedback(parent, delay)
    local h = parent:findFirstChild("announcement")
    if h ~= nil then
        local txt = h.Text
        wait(delay)
        if h ~= nil and h.Text == txt then -- Make sure that there is not more feedback.
            h:remove()
        end
    end
end

function compilePlayers(players)
    local names = ""
    if #players == 1 then return players[1].Name end
    for i=1,#players do
        if i == #players then
            names = names.. "and ".. players[i].Name
        else
            names = names.. players[i].Name.. ", "
        end
    end
    return names
end
----------

function setTag(parent, type, name, value)

    local tag = parent:findFirstChild(name)
    if tag ~= nil then
        if tag.className == type then
            tag.Value = value
        else
            local newTag = Instance.new(type)
            newTag.Name = name
            newTag.Value = value
            newTag.Parent = parent 
        end
    else
        local newTag = Instance.new(type)
        newTag.Name = name
        newTag.Value = value
        newTag.Parent = parent 
    end
end

function getTag(parent, type, name, default)

    local tag = parent:findFirstChild(name)
    if tag ~= nil then
        if tag.className == type then
            return tag.Value
        else
            print("No tag of the specified name and class was found in ", parent)
            return default
        end
    else
        print("No tag named ", name, " found in ", parent)
        return default
    end
end

function died(player, humanoid)
    if player ~= nil then
        if humanoid ~= nil then
            if humanoid.Health == 0 then
                setTag(player, "BoolValue", "survived", false)
            end
        else
            setTag(player, "BoolValue", "survived", false)
        end
    end 
end

running = true
function start()
    local players = game.Players:getChildren()
    local connections = {}

    running = true

    for i=1,#players do
        if players[i].Character ~= nil then
            setTag(players[i], "BoolValue", "survived", true)
            table.insert(connections, players[i].Character.Humanoid.Changed:connect(function () died(players[i], players[i].Character.Humanoid) end))
        end
    end

    while running do
        wait(1)
    end

    players = game.Players:getChildren()
    local survivedt = {}

    for i=1,#players do
        local survived = getTag(players[i], "BoolValue", "survived", false)
        if survived then
            setTag(players[i]:findFirstChild("leaderstats"), "IntValue", "Survivals", getTag(players[i]:findFirstChild("leaderstats"), "IntValue", "Survivals", 0) + 1)
            setTag(players[i]:findFirstChild("leaderstats"), "IntValue", "Points", getTag(players[i]:findFirstChild("leaderstats"), "IntValue", "Points", 0) + bin.points.Value)
            table.insert(survivedt, players[i])
        end
    end
    bin.points.Value = 0



    for i=1,#connections do -- Disconnect all previous connections.
        connections[i]:disconnect()
    end

    if #survivedt > 0 then
        feedback(game.Workspace, compilePlayers(survivedt).. " survived.")
    else
        feedback(game.Workspace, "Nobody Survived!")
    end
    removeFeedback(game.Workspace, 3)
end

function runningChanged(run)
    print("Running Changed")
    if run.Value == true then
        start()
    else
        running = false
    end
end


function newPlayer(player)
    local stats = Instance.new("IntValue")
    stats.Name = "leaderstats"

    local points = Instance.new("IntValue")
    points.Name = "Points"




    local survivals = Instance.new("IntValue")
    survivals.Name = "Survivals"
    survivals.Value = 0

    points.Parent = stats
    survivals.Parent = stats
    stats.Parent = player
end

game.Players.ChildAdded:connect(newPlayer)
bin.running.Changed:connect(function () runningChanged(bin.running) end)
print("Leaderboard Loaded")

`

This is the code for my datastore:

local datastore = game:GetService("DataStoreService"):GetDataStore("GameStore") --Call "GameStore" whatever you like


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

    local points = Instance.new("IntValue") 
    points.Name = "Points" 
    points.Parent = leaderstats

    local survivals = Instance.new("IntValue") 
    survivals.Name = "Survivals" 
    survivals.Parent = leaderstats

    local key = "user-" .. player.userId

    local storeditems = datastore:GetAsync(key)
    if storeditems then
        points.Value = storeditems[1] 
        survivals.Value = storeditems[2] 
    else
        local items = {points.Value, survivals.Value} 
        datastore:SetAsync(key, items)
    end
end)

game.Players.PlayerRemoving:connect(function(player)
    local items = {player.leaderstats.Points.Value, player.leaderstats.survivals.Value}  
    local key = "user-" .. player.userId

    datastore:SetAsync(key, items)
end)

Thank You and help would be appreciated