Back when I used to write, I found I got less interested the closer I got to the end of something. Once I knew where I was going, actually working out the words and writing them down wasn't fun anymore. I also found I couldn't commit myself to any particular time to write. Some days I could be in the mood to write all day, and do so; other days I couldn't write no matter how long I stared at the screen, and I couldn't predict which would be which. If I wanted to get writing done, I needed to make lots of opportunities, but be willing to accept that any given opportunity might not result in any writing.

Nowadays, I can confidently predict that I will only be in the mood to write when it is logistically impossible for me to do so, and so I do not write anymore.

Interestingly, one significant transition along that path occurred when I first went on psych drugs. I pretty much just stopped writing then. (It was an entirely worthwhile tradeoff.)