Tips for Editing Shorter

Look at pairs of sentences. Is one a reformulation of the other? Cut the worse one.
Are you giving too much away?
Are you hitting the reader over the head? Readers like to come to their own conclusion. Lead them to the water and let them choose to drink.
Which adverb is the most unique, the most telling?
Combine secondary characters
Cut entire scenes that the reader can assume or are simply uninteresting
Cut distractions, wandering thoughts, randomness
Cut any overworked metaphors.
Cut extra voices that take away from stronger voices.
Look at descriptions and make sure your pov would notice these things.