I don't know if you can pay ahead (I imagine there's a way, but I couldn't find anything quickly), but you can sign up for auto-renew. That way you don't need to worry about remembering to pay the renewal.

Hi goraleksi,
Yes, auto-renew is the best way to keep your Pro going.

Another option if you need is to purchase a gift Pro upgrade and then you can apply that to your account.

If you have any concerns or specific needs, feel free to contact us and we can discuss anything via email!