>

There's actually things like the US Federal Circuit, which is a specialized circuit that only hears appeals on certain cases regarding the federal government.  It could probably make sense to create an analogous jurisdiction of trial courts that are not "districts", but rather designated courts of first hearing on such matters.
That or you just let whatever district courts have first hearing but remove appellate jurisdiction away from the regional circuits.
It’s a problem.  Anyone who wants to block a new policy can bring any number of suits to any number of judges — you only have to find one judge who agrees with you.  There’s no sport in the world in which 1-30 constitutes a winning season. >

Would an example of this be the student loan forgiveness Biden signed which was ultimately blocked by a single federal judge? >

Yes, absolutely. >

Not sure how it could be implemented, but maybe you just shouldn't be able to choose where to file a complaint if it's not solely affecting that jurisdiction? Like, if the complaint is concerning a national matter, it should be arbitrarily assigned to a random federal court.