In my case, any disorganization I have towards something usually coincides with my extreme disinterest towards it. For instance: laundry. People seeking your services would have a vested interest, of course, in trying to improve upon things, but how do you plan on overcoming ingrained, habitual lifestyle decisions that brought people to vast disorganization in the first place?

It might be the reason people do area-specific organizational stuff: weddings, parties, corporate org charts, etc. Solve for a specific subject matter, to where basic principals and practices have established success, and apply them liberally.

Otherwise, people's lives, as a rule, are messy, not because of outside forces, but because they consciously choose to have their lives be messy. I would worry you'd be dealing with more psychological drama than actual organizational practices.