Even if you do NOT expatriate, you should file returns (3 years) under the streamlined program, a service we provide. See https://globalnews.ca/news/3719486/irs-fines-toronto-man-165000/
If you’d like help with the actual expatriation I know a few good lawyers who do that. But note, that it can get expensive (but so too can plumbing and I’d rather call a plumber than try to fix a complicated plumbing problem myself).
See https://globalnews.ca/news/1671945/meet-the-alberta-man-who-went-to-tijuana-to-renounce-his-u-s-citizenship/