90 Day relationship

Can you explain how the 90 day relationship works when you are single and want to try a 90 day relationship with yourself? I am interested to try this but also feel like I spend a lot of time alone (I work from home) and sometimes I do nice things for myself, so I’m struggling to see where I make the change to shift my current relationship with myself into a 90 day relationship. I do feel lonely and would like a better relationship with myself as I do often try and distract and buffer.