You might consider practicing finishing. Select a book (preferably not a huge one) and read the whole thing. Then read another one. Then start and finish a smal

You might consider practicing finishing. Select a book (preferably not a huge one) and read the whole thing. Then read another one. Then start and finish a small project. If you are presently able to finish something that is doable in one sitting, then expand to two sittings. Or whatever. I'm a random stranger on the internet, and this might not help you at all. But it seems to help me.