I read that you have a job lined up for October, but I suggest you read the i-864/affidavit of support instructions. Just make sure you're ready to submit it if/when they accept your case. If you need another sponsor to help, work on that.
Be ready, make sure no delay will come from you.
I think I remember citizens also using the school calendar as another argument why they would benefit from moving soon/having their case expedited. Maybe look into your child's future school calendar.
Final point, I know nothing about your/your spouse medical conditions, but will you be ok to fly?
Again, best of luck.