I am more guilty of this than anyone and I don't have any solid advice that has worked in the long-term so I'll be following this thread.
That being said... in the short-term.... I'd suggest taking a break from the project for at least a few days. Go for a long boring walk around your neighborhood if you are able to. Get your senses stimulated. Try not to think about the project during this time but you will find when your brain invariably goes back it doesn't feel quite the same. Possibly new connections are made or decisions to let things go are made. Or not. At least you got away for a bit.
That being said... in the short-term.... I'd suggest taking a break from the project for at least a few days. Go for a long boring walk around your neighborhood if you are able to. Get your senses stimulated. Try not to think about the project during this time but you will find when your brain invariably goes back it doesn't feel quite the same. Possibly new connections are made or decisions to let things go are made. Or not. At least you got away for a bit.