If "the tip rate is going up", that is entirely a problem of your own making. You chose to tip more. You can also choose to tip less, or not at all (by going to restaurants with counter service).
If you as a worker wish to represent 20% of the cost of my meal off the top, in addition to whatever portion you also may get from the menu list price, you are a growing cost, one that invites cutting. There are vending machines that make entire fresh, oven-baked pizzas now. The robot does not get a tip. The service worker just cleans the thing according to a schedule, and refills the ingredient hoppers. Even McDonald's is installing robotic cashiers.
It's easy to find tipping guides written by current or former service workers that self-servingly inflate percentages over the historic tipping rates. But those writing such guides are basically advertising that they are becoming less productive workers. That seems like a dangerous thing to do in a world of cutthroat cost-cutters.