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In general, blurbs should be grabby and well-written. They shouldn’t be too long (I’d suggest around 150 words) and they should establish your story’s conflict and your protagonist’s stakes.
It’s also worth mentioning comparable titles in your blurb as a lot of people will decide to read a book purely because other people say it’s similar to something they’ve already read and enjoyed.
Your cover should be genre-appropriate and look like it’s been designed by a professional rather than an amateur. And your Look Inside should read the reader wanting more.