Put some teeth into the do-not-call list:
Upgrade callerID to use ANI or some other tech to prevent it from being spoofed or blocked; so we can find the bastards.
If you can figure out a technical way to do that without interfering with the legitimate reasons for spoofing Caller ID that works reliably, go for it. Get a patent, then lobby Congress to make its use mandatory.
Good luck on that.
Remove the exemption for charity and political fundraisers and pollsters.
The reason those exemptions exist is that SCOTUS case law suggests - very strongly - that not including them would make the law unconstitutional. So good luck with that, too. (I agree they should be illegal, too, but they're not.)
Remove the "existing relationship" loophole so that when you add your number the calls STOP unless you explicitly exempt them (And that exemption should be revocable.).
From what I read, that's been done, as of last year with the new rules from the FCC. From https://consumercomplaints.fcc.gov/hc/en-us/articles/202873880-Rules-and-Resources-for-Dealing-with-Unwanted-Calls-and-Texts:
An existing commercial relationship does not constitute permission to be robocalled or texted.
Consumers can take back their permission to be called or texted in any reasonable way. A calling company cannot require someone to fill out a form and mail it in as the only way to revoke consent.
Virtually all robocalls are illegal.
Remove the 31-day wait when a number is added (Seriously, WTF? I'm not buying a gun here. I don't need a cooling-off period.)
That is to allow time for the telespammers to get the updated list - that they are required by law to buy and honor. Make it too onerous to comply, and the law gets struck down.
And crank up the penalties for violations such that it will hurt even a SuperPAC... maybe add in some criminal penalties too.
I think existing law is actually sufficient. What's needed is to give the FCC about an order of magnitude (or two) more money for enforcement. They do go after the worst of the telespammers, and they do impose huge fines. They just don't have the resources to go after more than the very worst. So write your congresscritter and tell him to give them more money.