hi lesmisrable

I'm 46 and is contemplating similar thoughts as you, except i am in banking technology and is getting 3.x times more

My health is failing me so much that i predict i won't live to see 65 if i don't slow down

Anyway, i share what i know.
We should look at career or income as two types passive and active. What we need is just $$ to pay bills and tide for retirement.

Most people (myself included) derive main income from active earnings,like a salary and always looking for way to find less stressful active income. I have concluded high active income comes with high stress, so such thing as less stress for same pay .

What most miss out is plan for a passive income stream (again, myself included). For a teacher, you can actively teach or tutor, or do it passively like make a video...
In fact, consider creating a Udemy course and see if anyone will pay to learn from you.

Hope you the best in your efforts