A cat left home by itself can get lonely and bored. That’s why you need plenty of toys to keep your cat happy along with spending lots of quality time with your pet when you’re home.
Since cats can’t talk (or they simply refuse to admit that they can), you may need to watch your cat’s behavior for signs that it’s lonely. Overgrooming aggressiveness or litter box issues can be signs that your cat is lonely or just feeling normal. In any case, consider appeasing your cat with more treats and toys because that’s what it wants anyways.