Datastore, no errors in output. The API is enabled, but doesn't work. Why? [closed]

I just started working on datastores as I wanted to learn. I wrote up a code, and enabled API services. There are no errors in output, but when I change my values, they don't save can anyone help?

local DSService = game:GetService('DataStoreService'):GetDataStore('DataStore')
game.Players.PlayerAdded:connect(function(plr)

    local uniquekey = 'id-'..plr.userId
    local leaderstats = Instance.new('IntValue', plr)
    local savevalue =  Instance.new('IntValue')
    leaderstats.Name = 'leaderstats'
    savevalue.Parent = leaderstats
    savevalue.Name = 'Cash'


    local GetSaved = DSService:GetAsync(uniquekey)
    if GetSaved then
        savevalue.Value = GetSaved[1]
    else
        local NumbersForSaving = {savevalue.Value}
        DSService:SetAsync(uniquekey, NumbersForSaving)
    end
end)

game.Players.PlayerRemoving:connect(function(plr)
local uniquekey = 'id-'..plr.userId
local Savetable = {plr.leaderstats.Cash.Value}
DSService:SetAsync(uniquekey, Savetable)    


end)