A major factor affecting a house cat's happiness is their environment. Cats are fairly independent animals, so they love to have their private space where they can feel safe and comfortable.
A cozy bed is the first level, but that may not be enough for your curious friend. See if you can attach extra cat shelves to the wall, place radiator beds, or simply free up some space for your cat to climb up and hide if they need to. Cats love heights because they allow them to oversee any potential dangers, and thus make them feel more at peace.
Since felines can spend hours sleeping or dozing, try to create many cushioned napping spots around your house in sunshine and shade, high and low, or in your backyard if you have one.
A good-quality scratching post is another must-have element in a cat household. Not only will it fuel your feline friend's desire to sharpen their claws but will also give your couch and carpet a few more years to live.