"User can't change content on this board"

My free trial recently ended a couple days ago, and since then, I am not able to make ANY edits on my board even though I am the sole owner and super user for the project. I am the only person who has access, and I created the workflow and project board. However, now I am unable to make changes to any of my work. Is there NOTHING available to free members? Am I required to buy something in order to restore my access to my board? Any advice is welcome please.