As a professional - beyond a point it becomes repetitive and boring. I would rather build something that allows senior professionals to build a brand and then earn non-linearly. More akin to book sales than therapist.
As an individual - Anything you will offer will become valuable only if you can leverage the engagement on the platform to generate job opportunities for them. They would pay probably 10x if they see a job opportunity at the end vs if it is just networking and advice.
While the idea is great i.e. Connecting senior professionals to career seekers, business model probably needs to tweak a little