Nothing major but about when I turned 40 I went and did a lot of fun exploration of new programming languages and ideas. I did some game projects, some coding challenges on various websites, some hobby open source contributions and projects. It was all work very different than my day job, played with a lot of new languages. F#, Rust, Typescript, Nim, Go etc.
This ended up being really good when job hunting, I was up on all the hip new stuff, so I don't come across as being dated, and it was fun and I learned a lot. This didn't result in a total career turnaround or anything but I did get a lot of offers and better pay the next time I had to get a new job.
Sounds like you have some decent fundamentals and could easily ramp up skills in some field you are interested in and get more interesting work.
This ended up being really good when job hunting, I was up on all the hip new stuff, so I don't come across as being dated, and it was fun and I learned a lot. This didn't result in a total career turnaround or anything but I did get a lot of offers and better pay the next time I had to get a new job.
Sounds like you have some decent fundamentals and could easily ramp up skills in some field you are interested in and get more interesting work.