I've heard some good suggestions for overused and/or weak words and phrases for which you might use the Search feature when you're editing. This article mentions a few; although they don't specifically say it, you can use Search on #2 as well by looking for "It" and checking the "case sensitive" box.
I've also heard of using a Wordle to look for repetition. I suspect this is not all that helpful, as it will probably bring up mostly words you can't avoid repeating a lot, such as characters' names. Its true appeal may be more in the inherent neatness of Wordles, which seem to be everywhere lately. I've never made one, but I do stare at them, much the way I stare at pretty fish in aquariums.
*Wordles Rabbit and Cougar*
Okay, what I said about this not being helpful? Do not listen to foolish, five-minutes-ago Nic. This is the coolest thing ever. I'm not going to post it because, impossible as it might seem, it actually contains at least one spoiler, but I am impressed. Naturally, the biggest things are the major characters' names (and I'm happy to see that "Rabbit" and "Cougar" are about the same size), and the smaller words include such things as "Rabbit's" and "Cougar's," as well as the names of almost every other named character. They also include a lot of prepositions like "around" and "toward." (Thankfully, unless you tell it to do otherwise, Wordle takes out "common English words," so no "the" or "a.") It's fascinating to look at some of the other words and think of the phrases I use that would put them into the Wordle. "Bit," for example, is in there, probably due to my