How do I fix the helix on my left ear? (Photo)

You have a Darwin's tubercle, a small cartilage knob on the helix. This can be easily removed under local anesthesia in the office. Minor asymmetry could persist as you may have a slightly flatter helix on that side as well, but this is usually NOT detectable to the casual observer even if the patient notices it.

This would be simple to change with and incision behind the ear.  If you want to change it.  Talk with a board certified plastic surgeon to make a plan.
Thanks for your question

The pointed cartilage also known as Darwin's tubercle, can be removed with incision made in the back of your ear in the office surgical facility.

It's simply an extra cartilage prominence that grows in some but not all individuals, and not in both ears. It's called Darwin's tubercle; many people have it. I do a lot of ear surgery. The thing about ears is, nobody ever sees both ears in normal social situations and people never recognize these minor asymmetries that EVERYONE has. Only in portraits do people see a part of both ears at the same time. To remove this would require a simple incision over the point, which can be biased toward the back side of the ear. A quick shave and stitch and that's it. It can be done in the office. Very simple. Hope this helps.