Bunny, congrats on hitting your goal weight! Many of us would love to be in that position.
As to falling off the wagon, since it happens to EVERY-SINGLE-ONE-OF-US… just start again tomorrow, and as you will see everywhere on this site… Keep Calm and Keto On (KCKO)
Now, to the core of your problem. Carbs should never be re-upped. Doesn’t mean you should not eat foods with carbs, but if you are insulin-resistive. i.e. your insulin doesn’t work like it should, then you should definitely do your best to avoid carbs. PS 30-40g of carbs IS NOT HIGH CARB. It is still low carb, but just higher than what your body can manage.
So, to solve your problem. Eat healthy, with the goal of Low Carb, Moderate Protein, High/Healthily fat.
In your specific case, you need to think in terms of calories. How can you get more calories so that you can maintain your weight. Since both Carbs and Protein are out… the answer is fat.
Congratulations you now get to eat as many delicious fat bombs as you want! Head over to the recipe section and start exploring the amazingly tasty options that you have. Consider doubling the amount of butter, olive oil and coconut oil in any normal recipe you cook. Look for cuts of meat that have higher fat content (i.e. avoid chicken breast, lean cuts of meet etc), and feel free to sneak as much cooked bacon as you can in to your salads or dipped in 90% chocolate, mmm.
This is why I say so many of us are going to be envious of your achievement. If only we had the same “problem” we would be dancing in the streets. You basically don’t have a problem, but an incredible opportunity.
KCKO, and let us know how you are progressing! We all need an inspiration and you can be that to everyone here.