That's for you to decide, I guess.
I'd need more details on the amount of time and effort involved before I'd make a decision of "retirement hobby" versus "career change". (I, unlike MMM, don't buy into the "if you are FI and call yourself retired, even if still working, you're retired"--though I'm not going to join the IRP and go around and call people on it, but you asked. Except EFB. I'll call him on it, cause gods, we gotta get that guy out!).
But what I think doesn't matter, it's what you think.
And actually, what you think (retired or not) doesn't matter either. Do what you want to do, and who cares about how it's labeled?
If you want to start an investing partnership and work with people, and it's a job, or not... so?
Enjoy yourself. It's later than you think.