I always tried to really ease back into things. Now I wasn't a real low carb dieter myself, so I may not have skewed my sensitivity as much as some people do, but despite very convincing arguments from people on both sides of the matter, I prefer small steps be utilized.
The real issue to look at, is what your contest diet looked like in order to assess how careful you need to be once you reverse things. With clients of mine, I've had a couple of female competitors that had to run keto plans in order to really dial them in, and the steps of switching gears was a slow juggling of not not macro #s, but volume of weight work, and cardio protocols as well.
Obviously you may have sodium and water issues, but judging by photos, you can really tell how things are going, but if you consider that a bowl of oatmeal is only about 25g of carbs, and 150 cals, that may seem like the perfect weekly bump in terms of both calories and carbs when you're dealing with a competitor who has been through a rigorous prep.