Yes, you can absolutely create additional free teams, each with their own 10 board limit. The limit on number of teams is purely a technical one, so high that there's not really any danger of hitting it.
The other option is to use Personal Boards (no team) instead. These will work the same as on a team, and you can still collaborate with others on your board, and there's no limit to the number of boards you can have as Personal Boards.
More information on that is here: https://help.trello.com/article/1177-personal-vs-team-boards
If you had to thrive a new habit during a lockdown, what would it be? Trello
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event