help, it wont work, it doesnt save my progress, what do i do?

local script:

script.Parent.MouseButton1Click:Connect(function()
game.ReplicatedStorage.UpdateData:FireServer()
end)

server script:

local DStoreService = game:GetService("DataStoreService")
local CashStore = DStoreService:GetDataStore("Cash")

game.ReplicatedStorage.UpdateData.OnServerEvent:Connect(function(plr)

        local MaxHealth = game.Workspace:WaitForChild("player.Name"):WaitForChild("Humanoid").MaxHealth
        local CashValue = plr:WaitForChild("leaderstats"):WaitForChild("Cash").Value
        CashStore:SetAsync("plr_"..plr.UserId, CashValue, MaxHealth)

end)
game.Players.PlayerRemoving:Connect(function(plr)
    local MaxHealth = game.Workspace:WaitForChild("player.Name"):WaitForChild("Humanoid").MaxHealth
    local CashValue = plr:WaitForChild("leaderstats"):WaitForChild("Cash").Value
    CashStore:GetAsync("plr_"..plr.UserId, CashValue, MaxHealth)
end)

it wont save my progress