Small changes in your own natural behavior are telling. You should pay more attention to them than you probably do.
When we’re in a healthy mental state, we improve our environment. This is true across cultures, across ages, for pretty much everyone. When you feel safe and prosperous, you improve your environment because your gut instinct is that you’ll get to keep your environment. When you feel unsafe or unhappy, you don’t bother.
Far be it from me to suggest that everyone with a clean house is mentally thriving and everyone with an unkempt one isn’t, but the relative change is important. If you find yourself suddenly skipping over small tasks because they don’t seem “worth it,” then you should pay immediate attention to that change. If it’s a symptom of something else, it’s better to know sooner than later.