For Season subscriptions, a few days before the automatic renewal date, and if you have the automatic renewal option enabled in your profile, you will receive an email inviting you to purchase the subscription in advance.
Please follow the information provided in the email to be able to proceed this way, which usually consists of visiting the Subscribe section once logged, and clicking the offer which will be displayed there, according to your profile and previous subscription.
Other subscriptions, like Yearly or Monthly, cannot be renewed in advance.