I’ve been out of the army since OCT 2019 and I’m in the process of going back in with a different MOS. Do I go straight to AIT?

I had a couple of buddies of mine who were out for like 3-4 years and recently went back in again in another MOS. They were sent to their MOS school and that was it. But they were in the guard. Were you active? You should be in the IRR still if I'm not mistaken.

Ask your Recruiter, it an depend on your new MOS

If you pass MEPS and pick a whole new MOS, then yea, you would ship to AIT when your orders are published and distro'd.