> Step 1 would be passing an update to the Sherman Act through Congress that would survive the current Supreme Court.

The nice thing about antitrust laws is that they're right in the core of the interstate commerce clause, so it's a real stretch to find them unconstitutional and in practice that hasn't been what has happened. Instead, because the Sherman Act is extremely broad but not very detailed, they've just been narrowly interpreting it. Which wouldn't work if you would pass something that explicitly spelled out some of the things. Like just go make a list of all the existing antitrust cases where something bad was found not to be a violation and make a line in the new law that explicitly calls out that one as "yes it is". Which deletes all the precedents anyone could use to claim that their bad behavior is allowed, since Congress just explicitly said that it isn't.

Another great improvement would be to allow anyone to sue for antitrust violations instead of requiring the government prosecutor to do it.

It would also help to get some bipartisanship happening. The current Court has a conservative majority but you only need to convince two out of six, and some of them are more partisan than others, which actually gives you two ways to win. One, you make a good argument and convince the reasonable ones. Two, you stir up the conservative base against some California corporations. Probably easier to do the next time there is a Democratic administration because then they'll start kowtowing to the new administration instead of Trump and thereby anger the conservatives again.