Go back on plan.
I think a little fear when it comes to regaining is healthy, actually. Unfortunately, it's not always enough to keep you in check, so I think going back on plan and reigning things in is a great way to thwart a regain
Also, I don't know how long it's been since you've been maintaining, but maybe your body is just trying to find a happy place to settle at? I shot for 130, then settled at 135, but my "happy" place is 138-143. It may take some time to figure that stuff out, too.
Congrats on reaching your goal!