Change US tax law from citizenship based law to residence based law.
The requirement for all US persons permanently residing outside the US to lodge annual tax returns and other financial reports is an onerous requirement that, and due to international tax treaties, results in minimal tax revenue for the cost to process reports.
Onerous annual reporting requirements are being made even more so by the lack of properly educated and trained local tax preparers. US based tax preparers are not fully versed in all of the various tax laws particular to every country and contacting the IRS or the Department of the Treasury often results in contradictory advice.
Tax revenue would be better maximized by focusing on the over 300,000,000 residents in the US including those with offshore accounts instead of those residing permanently outside the US.