Can I modify / upgrade / downgrade my subscription?

Yes — you can change your plan whenever you need to. If you upgrade mid-cycle, you'll only be charged for the remaining days on your new plan, so there are no awkward gaps or double billing.

Downgrades and cancellations also work any time. You've already paid for the current month, so you'll keep full access until the end of that billing period, and the change takes effect from the next cycle.