Take it to Apple, since there’s no other sign of damage don’t mention the fall.
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The camera isn't damaged, something just moved inside the camera module due to the fall. Take it to a trusted technician or an Apple store for a revision, maybe it's just disassembling and assembling the camera again.
I do that kind of things by myself, but I suggest you to not try it unless you know what you're doing
Or change the camera if you want to take no risks, your phone your choice
I dropped my iPhone 11 a couple months ago. Very short fall only about 2 ft from sitting. But it landed on concrete paver stones. One of the camera lenses shatter and the zoom would no longer work. It would still take pics with the other lens, but would get weird when trying to focus on objects. Zooming in and out ever so slightly. Made it impossible to take any reasonable pics. I just upgraded to a 15 Pro. The 11 works fine for everything but pics. I feel you pain. Check with your carrier. I had a great deal on an upgrade and my parents helped out. Wasn’t too bad.