You should start with the room that is bothering you the most. Fill your cup first, and the way to do that is to have a space in which you’ll love spending time because everything is in its place and you’re able to enjoy it.
Another thing to consider is to start in a room where there is less emotional clutter. For example, items in the bathroom are easier to get rid of than your closet, where you’ll have to try things on and analyze if you’re going to need them in the future.
You may want to start in your home office because it’s your command center for your life and business, or you may want to start much smaller and tackle your purse and wallet and get your money and receipts organized...
You may choose your bedroom because it would be a great prize to come at the end of the day to rest in a place that is tidy and beautiful, or you may go for the foyer because it’s the first impression of your home and entering a space where you could breathe would be very motivating.
Selecting a space in your home where your family won’t undo the work in five minutes, for example starting in the kids’ bedroom and seeing it messy the next day would be very discouraging.
If you choose to start with one of the bigger rooms, like the kitchen, prioritize one area that you’ll finish and then continue tackling different areas the rest of the week. Organize your pantry, your fridge, or your junk drawer... just finish something before you move on to the next area.