When I say put your customer on your wall, I mean actually. A picture of your customer, printed/drawn and stuck on your wall in full-view via whatever means necessary.
Alongside the picture, include the following information. Do your research and make sure it's accurate. This is your core customer, but you can have as many of these as you like. I would recommend having your core customer followed by 2 secondary customers.
Lifestage (married, single, cohabiting; family, pre-family, empty nester):
Children's ages (if applicable)
Location (e.g. city, suburbs):
Finds inspiration in:
Where are they online (social channels used):
Related to your business