Lost too much weight for my dress

I recently posted about my dress. I lost about 30lbs and my dress can be altered small enough BUT it will cost $450 just for the bodice and with the bustle and hemming it will be $800 total and I was warned losing more weight will cause it to not be able to be altered. The other issue is I'm not done losing weight and still have another 10-15 to go and I'm on track to lose it. I don't want to stop for 6 months, I'm worried I won't be motivated to lose it anymore. So I am currently maintaining weight for now while I figure out what to do. I have looked through still white and other sites and cannot find a dress I like or in my size.

I only have less than 6 months so time is ticking! I am going to call the salon I got my dress from to see if it's possible to get a different size and swap out. But I doubt it because when I bought it I literally signed contracts saying I couldn't return for any reason. But this was pre-covid so maybe they will be more lenient? I'm hoping so otherwise I don't know what I will do.
Also I guess the plus size is if I do lose too much weight before my first official fitting I can just eat cake for a week and gain it back 😂Also my alternative thought is maybe I can save the skirt portion and try to find someone to make a bodice that fits? I will post below the first time I got my dress to last fridays fitting.