What to do if too late?
Pay the punitive tax for one year and count it as your contribution to lessons learned and 2 countries who benefit you. People are desperate to live in the US so hopefully everyone will admit there is a benefit to being American.
There are many things in life that are too late to take care of and some extra taxes for one year are not the worst possible thing that is too late.
If you’re running a business or earning more than a couple dollars, you should always figure out tax implications in advance. They should teach this in schools. If you didn’t, well, now you know for next year.