You can move to a higher plan at any time. Plans don't auto-renew, so moving to a lower plan simply means letting your current one run out and then choosing the plan you want.
See the Pricing page to compare what each plan includes.
There's no mid-cycle downgrade. Because plans don't auto-renew, you simply let your current plan reach its expiry date — you keep everything you paid for until then. When it expires, subscribe to the lower plan you want.
Before the lower plan starts, make sure you're within its limits — for example, remove extra chatbots or Pro-only integrations (Telegram, WhatsApp, Google Drive, BYOK) if the new plan doesn't include them.
When a plan expires: