Hi there, are you putting litter in the bottom of the cage as well as the litter box? You only need to put the litter in the litter box, having it everywhere is just confusing for litter training. The pee can just be wiped up with paper towel and a 50/50 vinegar water spray.
I don’t know of terribly many people who use carefresh as a litter, mostly because it is so expensive. Most people with rabbits here seem to use either paper pellet litter, such as yesterday’s news, or wood pellet litter. The wood pellets are sold as cat litter, horse stall bedding and wood stove pellets (brands without accelerants). The wood stove pellets are the cheapest option and I know people in the USA buy 50 pound bags for less than $10. You put a thin layer in the bottom of the box, and the pellets swell and disintegrate as they get wet. This makes it easy to sift through unused material to spot clean, or a lot of people leave it several days, sometimes adding some hay on top before changing.
I use wood pellets branded as horse stall bedding, I have a 2 tiered litter tray with a catch tray and a sieve tray. I put a scattering of pellets in the bottom tray to absorb urine, and a thin layer of pellets in the top tray for extra absorption. I clean my tray daily, but I only throw away the used litter that has disintegrated from getting wet, then I usually only need to add a tiny bit more daily to re-cover the bottom of the tray.