When someone keeps treating your time like it’s cheap, raise the price.

How much something costs teaches people how to treat it, and time works the same way. Show up whenever you are summoned, wait around, rearrange everything at short notice, and you have quietly published a rate. Nobody is being evil about it, they are responding to the terms you published, and terms can change.

Start with something small: no more same-day cancellations, no more waiting past twenty minutes, no more rides at midnight. Say it once, without a speech, and then hold it. The people who value you will adjust, and the others were never going to.