A lot of fish will suspend in deep water this time of year, especially if the water is well above 70 degrees like it is where I am. Try deep diving crankbaits that match the available forage (or brighter colors if really murky) in lengths from 6-10 inches. Fish can also be shallow, here try bucktails or spinner baits with color combos with chartreuse in the mix.
Muskie only come easy to those fishing for something else!
Good luck.