I'd add some kind of built-in, frictionless, privacy-respecting, user-friendly, transparent payment/micropayment system. Built on open standards so we could have multiple competing UX's and the best one(s) would win.
Basically, think about how Patreon and Kickstarter (which are not without their flaws) have allowed people to support creators more or less directly. Now, imagine if we'd somehow baked something like that in to the internet itself.
The web is 99.9999% garbage and one of the biggest reasons is because we spent nearly two decades training people that everything on the interwebs was free which meant that it had to be ad-supported which means that nearly everything has been forced to pander to the absolute lowest common mass-market denominator.
Even with some kind of "good" micropayment system, sure, most stuff would still be free/ad-supported lowest common denominator crap. I have no illusions. Just look at every other form of media that has ever existed.
However, just imagine how books or movies or whatever would look they were de facto forced to be free for the earliest part of their existence.