Force yourself to do things imperfectly
To give a very practical example, I have given myself an hour to write this post before I’m on childcare duty. I can publish the post after that hour or I can spend more time later polishing it and making it perfect. I’m forcing myself to publish the piece before the hour is up even though it probably has some typos and maybe could be written more concisely.
The extra couple hours I could spend polishing it won’t make a massive difference in the number of people who read and benefit from this post. Perfectionism is a tough habit to break so you have to set time limits and force yourself to just put things out there even if they aren’t 100% perfect.
I have this problem myself. (No, not about writing blog posts, but realizing how much work I need to put into things. I like to make it as good as I can – which is great if you have a lot of time for a lot of things, but if you have a set amount of time for a lot of things, you just need to learn how to deal with imperfections and let them pass through you.)