While reading the post and comments I also was raising the same question. What I'm going to try - add separate facts from technical books.

I like reading tech books which are not directly related to my job as SWE. E.g. I'm not working with Bitcoin or ML, but found those books very interesting. However after a year pass - I barely can remember little bits which I've found very interesting when read the books.

I think adding some facts to Anki cards would help me to remember those certain things. I guess difficult part would be to detect the fact which is worth to be added as a card. Since while reading the book - these things seems obvious. Going to try anyways.