It is good that the author is in a good space. I quit my dream job last October due to failing mental health arising from being forced to work inside a SCIF for a year.
It was the most exciting job I have ever had. I did work with real world impacts. People literally lived and died based on the things we accomplished in there.
Returning to the 'real world' outside of that realm, and I have never been as excited about work as I was then. Sure, I have gotten help and my mental state isnt in crisis anymore. But its not quite the same being on the 'outside' as it is when youre in the middle of above top secret projects that stretch every part of your capabilities.
It is through the help I received I know I can never return to that world; it was what literally caused the issues I was having. I do regret quitting my dream job quite a lot.