Hi Vanessa,
It’s true that many medical schools prefer that prerequisites are satisfied with a B- or better, so I would suggest retaking the class.  This will not only satisfy what medical schools like to see but also help you in preparing for the MCAT, since your foundation for organic chemistry will be solid and require less review/ relearning when you’re studying for that exam. However, depending on the med school, getting a significantly better grade in Chem 215 (if you think you can), could also be a way of demonstrating Organic Chemistry Competency. Additionally, if the reason you did badly is COVID19 transition-related, it is very likely the medical schools will be more forgiving than normal.
The only other option I can really think of is completing a post-bacc program after graduation, however this option is usually taken by students who need to drastically improve their GPAs and will not necessarily give you a strong background in organic chemistry or a different section of the MCAT.
I hope this helps!

Best,
Tina & Ruchira