datastore is not saving data?

local DataStoreService = game:GetService("DataStoreService")
local myDataStore = DataStoreService:GetDataStore("myDataStore")

local player = game.Players.PlayerAdded:Connect(function(player)

    local leaderstats = Instance.new("Folder")
    leaderstats.Name = "leaderstats"
    leaderstats.Parent = player

    local collectibles = Instance.new("IntValue")
    collectibles.Name = "Collectibles"
    collectibles.Parent = leaderstats
    collectibles.Value = workspace.Collectibles.Value

    local level = Instance.new("IntValue")
    level.Name = "Level"
    level.Parent = leaderstats
    level.Value = 1

    player.RespawnLocation = workspace.Level1.L1Spawn

    local playerUserID = "Player_"..player.UserId

    local data
    local success, errormessage = pcall(function()
        data = myDataStore:GetAsync(playerUserID)
    end)

    if success then
        collectibles.Value = data
    end

end)

game.Players.PlayerRemoving:Connect(function()
    local playerUserID = "Player_"..player.UserId

    local data = player.leaderstats.collectibles.Value

    local success, errormessage = pcall(function()
        myDataStore:SetAsync(playerUserID, data)
    end)

    if success then
        print("data saved")
    else
        print("data not saved")
        warn(errormessage)
    end

end)