1. change the font
This sounds very simple, but sometimes a simple change is all you need. Try changing the font or printing out your post before you edit it. Your eyes have gotten very used to the font you typed in. You've been looking at that font for hours, so change things up a bit so you look at it anew. You can also try changing the margins. The important thing is that the font looks different, so you can approach it as something you've never seen before. It's easy to skim a post without meaning to because you've looked at it so many times before.
Sometimes it can be good to break out of the WordPress editor and use a different tool.? For those of you on macOS, the Bear app is awesome and the fonts are beautiful (be sure to read our in-depth guide on https://editius.com/resume-formatting-service/)! It can also be exported to Markdown, HTML, etc for easy transfer to WordPress. Or you could try diving into Gutenberg.
2. proofread in stages
A good way to avoid errors is to proofread in stages rather than trying to do everything at once. Proofread once for spelling errors, then again for text flow, again for punctuation, again for grammar, and so on. Focusing on one type of error at a time should allow for much greater accuracy. Create a system with https://editius.com/paper-corrector/ so you don't miss anything. Just make sure you don't take too much time, because this method will obviously be more time-consuming.
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Don't rely 100% on a spell checker because it's not perfect; you'll want to make spelling one of your stages. A spell checker can't read your mind and doesn't know that you tried to spell a different word, which sounds similar. Although tools like https://editius.com/cover-letter-editing/ can help catch common mistakes, especially if you're proofreading when you're not fully awake. But remember, you shouldn't do that ?.
3. observe your contradictions.
Are they, or are they? Most writers know the difference, but when you type thousands of words in a day, mistakes happen and spell check won't catch them. Watch for these inconsistencies and other contractions. If you miss them, your writing can look really amateurish. The grammar police will find them! ?