The great news is that many of the prompts will overlap, so that will make the writing a bit easier!
I’d recommend starting with the most common prompts (ie. adversity essay, challenge essay, diversity essay, etc.). It’s important to be specific in your “Why Us” essays, so make sure to get started on those ASAP.
You can also prioritize by programs you feel are most likely to offer you an interview, or the programs you most prefer, though I think it’s difficult to gauge these unless you have a clear top choice. Best of luck to you!!