I'm not a writer and I'm pretty new to blogging so I can't relate to this problem (yet 😄) but I have a friend who's a very good music producer that has the same problem sometimes.
He told me that the best solution for him is to take one or two days off, go outside and do something you like. Being outside will let your mind breathe and doing something you like will inspire you.
Another important thing is to get a LOT of sleep! Our ideas are made and processed during our sleep, so make sure to get a lot of it during this little break.

Hope this will help you 😉