This is my experience, and your mileage may vary:
Multiple times in my coding career I have felt stalled and/or like I was regressing.
Early on, I worked on a programming language, gosu (https://gosu-lang.github.io/) which ended up not really going anywhere. Once the work on it was done, I returned to more mundane web programming for a while (over half a decade.)
A long while after that, and unexpectedly, I turned a jQuery function I was noodling on into intercooler.js (https://intercoolerjs.org/). After a year of that I returned to mundane web programming for quite a while (over half a decade.)
Unexpectedly, a year ago, the country shut down. I was at home and decided to see if I could remove the jQuery dependency in intercooler.js, and so created htmx (https://htmx.org/).
When creating htmx and removing some attribute/functionality that was in intercooler.js, I realized that a small programming language would be the ideal replacement, so I created hyperscript (https://hyperscript.org/) I had not expected to work on a programming language again, but now I am.
So my career has been some very exciting technical projects punctuating long stretches of pretty basic, boring web development, where the most exciting thing is me wondering if I can figure out what the deuce is wrong with my CSS.
My takeaway, at least in my career, is that patience is a virtue, and the interesting stuff tends to come up at irregular intervals and in unexpected moments and ways.