I would argue Visa and Mastercard and payment processing at large as the top priority by far. It's crazy that we've given up control as a society of the only mechanisms for electronic payments in an increasingly cashless world to unregulated private entities who continue to jack up fees as often as they can get away with. Makes everything 3-5% more expensive. Ridiculous.
But much as there's nothing stopping the Federal government from greatly simplifying the burden and toil of tax season by issuing 90% of Americans a pre-filled-out "This is what you owe; sign this and return it or dispute it with your own filing," we won't do that because fully half of Congress is from a party that has, as a plank, that private institutions serve the public interest better than public institutions.