After being gaslit by Uber support for weeks, they finally admitted to charge riders different prices, and that there was nothing they could do to reset my price multiplier[1]. I suspect it was because I added a Work profile with corporate credit card for a trip years ago.
So I deleted my account, waited 30 days for the data to be expunged[2], and created a new account under a new email address and without my middle name. The prices are now normal!
This plus drivers constantly cancelling rides, makes me avoid Uber as much as I can.
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[1] Quoting Uber support: "The prices of the trips and promotions are unique to users, that is correct. [...] There is sadly nothing you can do personally to change the fare rate of the trips before any discount is applied."
[2] After requesting to delete your account, I received an email asking to explain the issue and if they could help me. Replying "no" automatically reactivated my account and reset the 30 day timer.