'<eof>' expected near 'end' what do i do?

You need to put your cash.Changed function inside player added and you needed to remove an end after this if statement:

  if succes then
        print("YES")
    else
        print("aww not save")
        warn(errormessage)
    end

entire script:

local data = game:GetService("DataStoreService")

local mineminemine = data:GetDataStore("mineminemine")


game.Players.PlayerAdded:Connect(function(player)
    local stats = Instance.new("Folder",player)
    stats.Name = "leaderstats"

    local cash = Instance.new("IntValue",stats)
    cash.Name = "Cash"
    cash.Value = 10

    local gold = Instance.new("IntValue",stats)
    gold.Name = "Gold"
    gold.Value = 0



    local data
    local succes, errormessage = pcall(function()
        data = mineminemine:SetAsync(player.UserId.."-cash")
    end)
    if succes then
        cash.Value = data
    else
        print("aww not loaded")
        warn(errormessage)  
    end

    cash.Changed:Connect(function()
        if player.leaderstats.Cash.Value >= 10000 then
            player.leaderstats.Cash.Value = 0 -- Set the value = 0
            player.leaderstats.Gold.Value = player.leaderstats.Gold.Value + 1
        end
    end)
end)

game.Players.PlayerRemoving:Connect(function(player)
    local succes, errormessage = pcall(function()
            mineminemine:SetAsync(player.UserId.."-cash",player.leaderstats.Cash.Value and player.leaderstats.Gold.Value)
    end)

    if succes then
        print("YES")
    else
        print("aww not save :( ")

    if(errormessage)then
            warn(errormessage)
    end
    end


end)