I think it was more of a moral boost. The Eastern front is bad right now and throwing reinforcements at it wasn't going to help. By going into Kursk you embarrass Putin which is a huge win as well as gain a way to launch those crazy stupid drones that Ukraine has developed that is blowing up all those refineries and storage areas.

Kursk was interesting because it did really help out the Sumy region and recently Ukraine has begun pushing back in Kharkiv.

Moral boost was huge for the country though they needed a big win and they got one with Kursk