"Reading and writing more" are just aspirations. Those don't translate well to new behaviors. BJ Fogg (Stanford prof, behavioral scientist) lays out how to build new behaviors in Tiny Habits. You need to make them easy and attach the easy thing to something you already do regularly. (When I sit down to lunch, I read one page...) https://tinyhabits.com/

Secondly, your mind is interfering with its own work. Tim Gallwey talks about this in the Inner Game of Tennis (which is not really about tennis! ;). Your critic is not allowing you to "run hot" and put down some words that are less than perfect. It would be helpful to find something to focus your mind on, a simple count, like key strokes or word count. Alternatively, there's the practice of Morning Pages from the Artist's Way. Just let yourself write anything for a while. It's not for publication. You need to open the gates and you can do that by lowering the stakes involved with putting a word on the page.

Inner Game

https://www.amazon.com/Inner-Game-Tennis-Classic-Performance...

Artists Way

https://www.amazon.com/Artists-Way-25th-Anniversary/dp/01431...

I wrote about some other stuff here that helps.

https://vonnik.substack.com/p/a-few-ideas-that-made-my-life-...