Litter boxes might seem ordinary but every cat is different. Since you want your cat to use a litter box, you need to find one that your cat will actually use.
For senior cats, a litter box with a low entry makes it easy for it to climb in and out. For cats that like to kick aggressively, a litter box with higher walls might make more sense.
Whatever your cat does, you can likely find the perfect litter box for it to use. Now you just have to figure out which litter to use as well.