We know that situations can change, that is why we here at PlaytestCloud strive to make any account changes as seamless as possible. If you choose to upgrade from your plan you can easily do this from your account.
Just simply go to the toolbar, select the menu button (the three horizontal lines), select Settings from the dropdown menu
From this page you will be able to upgrade your plan.
When you do this you will be billed immediately and your remaining tokens will be rolled-over.