Oh boy
Me and Raph came up with this fic in December. I have real bad ADHD, unmedicated too so that makes it very difficult. I managed to write a 5k chapter in a day (its a start), and I think it made it a lot easier when I realized I should do it for myself too. Do it for growth and experience. Personally, I really hate this chapter, but I'll keep going until I like it. If you force yourself to do it, I don't think it'll help. I don't think putting pressure on yourself will do much good. Don't make it a chore.

"How do I make writing as fun as reading", I don't know if you can. I don't think you can force yourself to enjoy one thing more than the other, however, I do think you will begin to enjoy it more when there's an actual foundation to enjoy.
You cant start with a few lines and think its boring when you haven't even done anything yet.

ADHD sucks, being unmotivated in general sucks. You don't need adhd to feel unmotivated either, but regardless of whats holding you back, you'll figure it out, and it isn't the end of the world.