I can see you're on the Professional plan and looking to manage your subscription. I can't look into account specifics or process billing requests through the forum, since that involves details specific to your account. For anything related to your subscription, please reach out directly to our support team through the Support Hub.
Here's what changes if you move to the free Starter plan:
Dev Mode isn't available.
Your team is limited to a single project, with up to 3 Figma Design and Figma Sites files in it.
You can only invite collaborators to drafts with can view access, edit access on shared files needs a paid plan.
Team libraries, Figma Weave tools, and the full Figma agent experience aren't included.
On the Professional plan, you can:
Move people who only need to view files to a free View seat. From Admin > People, click their current seat type and switch it.
Adjust your seat count at your next renewal, so you're only paying for the seats you actually need going forward.