I relate to this too. I spent a year in a company were I was hired to kickstart their technology department but the CISO actually wanted to outsource developmen

I relate to this too. I spent a year in a company were I was hired to kickstart their technology department but the CISO actually wanted to outsource development (he used to be employed by the outsourcing company, what a coincidence!). Then I made a mistake of joining a fintech scale up that run like a body shop. Both places were very frustrating for me and tilted me into a burn-out (or even mild depression?) similar to what you describe. For a bit more than year the only thing I could read was science fiction books, when I would usually read ~20 technical books a year and do multiple courses. For a while I even thought I had somehow got ADHD as I couldn't focus. I came out from that about 6 months ago and I'm slowly coming back to my 'normal'. I put myself the objective of learning Functional Programming and just finished a couple of beginner Haskell books and courses, which I found quite refreshing.