Consider the areas of your home which are how you want them to be – decluttered, spacious, tidy, organized, peaceful. Even if it’s just one tabletop or one drawer.
Then ask: why does this space work? What’s special about it? It might contain only items for a specific purpose, it might get cleared regularly as part of some household routine, it might have special containers which keep it neat: what’s the secret?
Once you know why and how you keep this area decluttered and organized, you can extend that knowledge of what works for you, to other areas.