Members / Guests status swap

No you will still have full access. Only the people you added with comment only access won‘t be able to edit things anymore then.

Have a look here that explains the difference between org and workspace.

Who takes up seats in a paid plan:

  • In paid Workspaces, everyone counts towards your paid plan, Members and Limited Access Members (regardless of your email domain)
  • In teams, Organizations and Divisions, members with a corporate email domain (full Members and Limited Access Members) take up seats in the plan
  • Guests who do not share the corporate email domain do not count towards the paid plan and are free

In your case you‘d have to upgrade to a paid org to get unlimited free users.
I definitely recommend reaching out to support as they will be able to assist you best: How to contact our Support Team ✉