I have 4 PT failures and am 3 months away from my enlistment ending.

My commander/state would pretty much have already started the paperwork to get you out awhile ago.

AF/ANG have been clamping down on PT failures, espically when it comes to the whole "Deploy or get out" status

https://www.airforcetimes.com/news/your-air-force/2019/02/19/deploy-or-get-out-starts-now-what-you-need-to-do-to-stay-in-the-air-force/

You are the people they are looking to get rid of, and you are an easy case.

Ok, lets say I cant re-enlist, can I came back in to the Guard in say a year or 2 when I have lost weight

Why is it now you are all about getting into shape? You couldnt keep up with some of the easiest standards of all of the DOD and now you are worried about coming back in? What guarantees can you give that the next time is gonna be different if you were even allowed to reenlistment some way?