Did you ever consider giving up the PhD?
Actually, funnily enough I don't think I ever did, even when I knew that it would have been more relevant if I'd picked slightly different topics, something more focused on business ethics. Even when I got to that point, knowing where I wanted to go and knowing that the PhD wasn't directly relevant to it, I still never really lacked motivation. I don't know why because most people I talked to would take weeks out and struggle to get back to it but I just wanted it done basically. I was just absolutely determined that I'd finish this thing.