Yes - you can continue on the same server after your trial is over. You need to upgrade the existing server instead of creating a new server through the website.
To upgrade the server head over to the Control Panel, find your server and you should see a screen like this:
Here you can choose a plan, billing cycle and the payment method you would like to use. We only accept Credit/Debit cards, PayPal and credit at this point. If you would like to use PaySafeCard or crypto please add the credit to your account and then return to this page to complete your purchase.