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

Try using the actual game and not Roblox Studio or in Game Settings on Security and turn on Studio Access to API Services

Change the MaxHealth variable to this

local Character = plr.Character or plr.CharacterAdded:Wait()
local MaxHealth = Character:FindFirstChildWhichIsA("Humanoid").MaxHealth