Please don’t consider any day as a set-back... well, perhaps if you ate the entire contents of a pizza parlor. Smiles...
You’re under carbs and that’s key - and very good! We don’t know how under on carbs, but less carbs means your body can burn more fat. Under proteins for a day shouldn’t set you back, and a bit over on fats doesn’t strike me as a horrible day. I’d expect today will result in increased ketones - less carbs and more fats.
tomorrow will be another day and if you test your daily ketone levels, you might be happy with your results.
good luck and keto on!