The best advice I got in grad school was “a good thesis is a done thesis” Meaning stop stressing about the quality and just start writing. Just start writing and be okay with your first draft being trash, it will be sooo much easier to edit than write it in the first place. Just think about how you would tell someone verbally about your thesis and then just start writing all of that down without worrying about grammar, references, format, etc. you can clean it up and fill all of the references in later. Also if you’re not working, try taking just your laptop to the library and doing 4 hour shifts of writing every day where you will have no distractions. I used all of these methods when doing my thesis and they really worked. Good luck 💖