Apart from providing for their basic needs, I try to pay attention to each cat. A little pat here and there, then I observe them and give them the quality of attention they like. Cats are energy-filled beings and some, if without the opportunity to expend energy through play, may pick up fights with other cats.
As I am also an important resource and a limited one, I make sure to spend quality time with myself to recharge. Meditation has been very helpful, as well as spending time alone and not sharing my room with them 24/7. Of course, there is nothing like sleeping next to a cat, or a multitude of cats.