I'm mid-thirties working in Software/Data Engineering. I've been working at different companies during the last decade, and currently making ~$120k, and hitting no more than 40h/week.
I don't consider myself especially intelligent. Neither I'm dumb. I suffer from imposter syndrome from time to time, especially when I start a new job/challenge. I usually acknowledge these situations and manage to drive them without major problems. I have been in places where I was making way more but the job was boring, in startups where I was learning x10 every single day, I cut my salary to join especially talented teams, I stayed at places that required less than 10h/week while being paid for 40h... Sometimes I have been focused on pursuing a bigger salary, a promotion, or becoming a manager. I successfully accomplish most of these challenges. Every single situation had pros and cons, and none of them made me feel completely full-filled.
I thought I had a pretty good work-life balance but lately, I've been through health issues and every single doctor/therapist is pointing out to stress and sedentarism. Due to that, I've been reading some articles where researchers explain how people in tech started to care more about happiness and less about salary. I thought I was already doing that but looks like I've been doing something wrong with my professional career, and there is a path more equilibrated and focused on happiness I should follow.
Do you do something special?
I no longer assess my worth as a person as a function of job title, salary, or anything else.
I take contracting work primarily and expect absolutely nothing more than a paycheck. Work is a transaction and I deliver what I can and am not a jerk.
Almost every disposable penny goes toward physical fitness. My spouse happens to be cut from the same cloth, which is a big plus.
We don't live extravagantly unless you count the money for fitness, but we consider that to be an investment and not a frivolous expense.
Satisfaction in life for me comes from every angle EXCEPT my job, and that's my secret.