I would identify a few key users who have written posts about 'life organizing' or similar topics, really focus on the people that would be excited to use your product. Reach out to them, get their feedback, ask what current tools they use & what sites they visit any meetups/conferences to note?
Treat them as early adopters & value their insight.
If you're having trouble at identifying this kind of person you need to hone in on your ideal target customer, learn the keywords needed to find this type of person.
This will also help when you come to do a PPC campaign.