Quite obviously through regulation.

Complain loudly while you tip?

Try to avoid services that rely on tipping? Don't go to restaurants or order food delivery where you're expected to tip.

I understand it's not an easy thing to fix, and I sure as hell dont have the solution, but not tipping someone who is relying on tips is just a dick move

give the tip directly to the worker, and also hand them a pamphlet about organizing a union at the workplace

Don't use tipped services if you're not going to tip. There are alternatives. You're offloading your "political action" at the expense of the worker, while the owners won't care. Support legislative change, don't use your politics as an excuse to harm the workers of a service you chose to use.