Belgian Witbier is a direct throwback to the past. It's just about the only beer which we can with confidence state that it's pretty much the same today as it was in 1475 A.D.
It's a bucolic, farmhouse type of beer, where you take a little bit of everything and make a beer. This beer was traditionally made as refreshment for farm workers to drink during their daily toil. Thus, it's a fairly weak "kitchen sink" sort of beer - you don't waste your best ingredients or your best beer on something farmhands are drinking because it's hot and they're thirsty at 9:45 AM.
You must also keep in mind that the style was fully developed when drinking plain old water was considered unhealthy, so beer was many things to people.
In the first place, it's safe to drink it because it's boiled.
In the second, it's nutritious because of all the grain and yeast in it.
I could go on, but don't want to belabor the point, which is that Wit is meant to be drunk young and rather weak. Historically, carbonation is optional! I've made wit that could be drunk for breakfast and taste like something appropriate to have for breakfast, like a flavor admixture of oatmeal and the orange juice you drink along with it. I made it on a Sunday, kegged it on Thursday - yes, while it was still gently fermenting - and we were drinking it on Friday night. Was it carbonated? Yes, a bit. Carbonation changed over the course of the weekend. It was tasty - much more than I expected - light, and very well-received.
I make mine with a rather wierd mash of wheat (malted and unmalted), oats and barley (malted and unmalted); low hops levels, using aged hops; a mix of spices, including the de rigeur coriander and bitter orange peel, but also including anise, black pepper, paradise seed, and cardamom; and a mix of yeasts.
In my world, wit is best consumed as soon as it's finished fermenting and/or carbonated, should I choose to carbonate it. But your mileage may vary; I recognize that my method is somewhat removed from the BJCP standard, but I prefer the historical method to the modern impulse to overthink everything and I don't compete with this beer.
So my advice is to keep making the recipe and keep drinking the beer. Start taking detailed tasting notes. Eventually, you'll arrive at a conclusion of when it's best to drink your Witbier. It takes some experience and - gosh, can you stand it? - drinking of homebrew.
Cheers,
Bob