With any sport, the general rule is to never do something new for the first time that week, especially when it comes to diet.
Think of the hardest training session you’ve had so far while keto. Did you handle rolling like that? If so, awesome. The match will be even harder, but it’s absolutely doable because you know you can manage it. But if you’ve felt crappy during harder practices these last few months, then start transitioning out of keto and towards fueling yourself strategic carbs (not necessarily “high carbs”) ASAP.
But, no, carbing up shortly for the first time in months is a bad idea so close to a contest.