I recently adopted a litter of kittens and i dont know what to do with them.?

i adopted a litter of about 15 kittens from one of my neighbours, and ive had them for almost 2 years now and ive gotten bored with them, first i tried petting them, and then playing fetch with one of them but one died because of that, and i fed a few to a hungry dog, then i paired them up together and forced them to fight and now i only have 8 left what should i do with them?