A good blind, head to toe camoflage, and no movement is absolutely needed for success. Effectiveness of Owl decoys is hit or miss. Crow decoys are helpful, lots of dead crows in front of your blind even better. Flapping wing decoys draw their attention, spinning wing decoys not as much. Electronic crow callers work great, two going at same time with different sounds even better. Lots to like, lead shot, no daily limit, long seasons. Shoot a decoying duck you shot a nervous bird looking for the security of numbers. Shoot a decoying crow and you shot a pissed off bird looking for a fight. The best part, coyotes, fox, maggots, worms and bacteria like to eat them feathered and raw, no cleaning, no carrying them out, the original biodegradable target. Best live wing shooting in terms of action there is in the US. I prefer tight chokes and #6 shot. No matter how close you take them you can't hit a crow too hard.
PS. Crow hunting may open new opportunities for your other hunting pursuits. Many farmers have a disdain for crows and may grant you initial permission to hunt their land for crows, this can lead to a relationship that allows to hunt their land for other things as they get to know and trust you.