You have 2 options - you can remove collaborators until you get to 10 or fewer, or you can sign up for a paid account. You can check out the details here: support.atlassian.com/trello/docs/workspace-user-limit/#:~:text=in%20the%20sidebar.-,What%20if%20my%20Workspace%20has%20more%20than%2010%20collaborators%3F,-If%20your%20Workspace The good news is, you haven't lost any data, everything is still there, just in read-only mode until you make your decision.
What to do now, This message coming on my Trello - This free Workspace is over the 10 collaborator limit and all boards are view only.
You have 2 options - you can remove collaborators until you get to 10 or fewer, or you can sign up for a paid account.
You can check out the details here: support.atlassian.com/trello/docs/workspace-user-limit/#:~:text=in%20the%20sidebar.-,What%20if%20my%20Workspace%20has%20more%20than%2010%20collaborators%3F,-If%20your%20Workspace
The good news is, you haven't lost any data, everything is still there, just in read-only mode until you make your decision.