I recommend freewriting - writing down anything that comes to mind without censoring it. Or correcting it. Whether it be a typo or just a sentence you find off. It's usually used for writers, but it's used for writers to combat perfectionism, and you can probably benefit from it. If you wish to try it out, set a timer for 15 minutes or something. Making a habit of it could help get it down, if not eliminate it altogether.
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