You might want to keep trying to rise, using a path that builds on your natural strengths: sales, analysis, managing people, whatever, and keep asking for honest feedback. When you reach the point at which it feels clear you've topped out, revise your job description or take a step back. Up is not the only way.

Few people make a living as a public speaker but many people build it into their career. A career is like a suit of clothes: to look its best, it must be tailored and accessorized. So whatever career you choose, let's say it's social work - you can, for example, ask your boss - if you can give talks at housing project community centers about the social services available.

I believe that a core problem with undergraduate education, especially at research universities like Harvard, Stanford, NYU, etc, is that most teaching is done by PhDs, who by temperament, training, interests, and rewards are researchers first. So they spend most of their time and energy probing a snip of a field's cutting edge. In my view, the attributes needed to be a transformative undergraduate instructor are pretty orthogonal to that. It would seem that undergraduate education would be superior if there was a separate track for teaching faculty.

A half-hour before bedtime, I remind myself that I now deserve to prepare myself for a good night's sleep. You can't focus on your work if you're sleep-deprived even if you have a fascinating job.

Answering ads rarely works for career changers because you have no experience in the job for which you're applying.

Essayists write at a length that enables them, within a year, to explore a number of topics, whereas in a book, they'll likely only get to address one.

Senescence is an inevitability. All we can do is try to strike the balance between graceful acceptance and raging against the dying light.