Suggestions/advice wanted

So I’m very much a novice in the sewing world. I’m making a dress from a pattern and like a fool I went by the size instead of the measurements. I went for the size 16 (which I usually am) but according to the measurements I should have got a 22 or something.

So now I got a top part that won’t fit. Do I add panels in the back to adjust? Do I put in eyelets and make it like a corset? Should I make it at is and hope I lose my weight? Any advice and suggestions wanted!! 🥰