Unlimited Google Photos storage?

When I bought my Pixel 3, one of the appeals was that Google promised unlimited storage at Google Photos (although not at max resolution). Now, https://one.google.com/storage and https://one.google.com/storage/management tell me that I've used 97% of my storage, and it points to various videos of mine taking up a lot of space (and I thought that photos and videos taken by this phone would not "count" in my storage quota). In my Camera app and Google Photos app, I no longer see the obvious option that used to exist that said something like "upload lower resolution photos, which don't count against your quota". I have Android 12. How can I fix this so that Google Photos changes the resolution downwards of those uploaded photos and videos so that my storage quota frees up again? I don't want my Gmail to get discontinued due to lack of space, and I don't want to pay for storage that was supposed to be free.