I'm only ADHD but I get the project paralysis all the time when faced with something big. Recently I've been typing up a few lines of what I want to do covering the big picture then I list out in bullet points the key features or tasks. Once I have that I upload it to chat gpt and ask it to develop an outline with details or instructions for each bullet point.
Sometimes I have to refine my wording to get it to work, but I've finished several projects that sat for months and one for years just by using this method. I've also created a dedicated gpt to become an expert on the one really big project where it was the research that was holding me back, then just asked it questions until I had all the data I needed.
It's not perfect and you still have to do some work, but it's been working for me so I thought I'd share.