I see the problem. I’m just not sure I see a way out.
Congress should impeach him and forbid him from ever holding a public office again. If Congress doesn’t do that, I’m not sure what else can be done. I’m uneasy with the prospect of putting a former president in jail, although, given what he did on 1/6, I might be more open to the idea than I once was. But even if I could get comfortable with that in theory, I worry about finding a jury of 12 people who will convict him, and a hung jury will just embolden him. Practically speaking, I don’t know what else can be done if impeachment doesn’t happen.