Making decisions using employee polls is about one of two things.
One – Management and leadership think the decision is not important enough to deserve their time.
Two – Management and leadership don’t want to have that specific responsibility.
One way or the other, it’s a bad idea. Instead, find somebody who is competent and talented, and put them in charge of figuring that particular thing out. Help them collect the opinion of those who have something to contribute, and make it clear that it’s eventually up to them to decide on the course of action. Support the final decision, measure success, and help them improve.
Polls don’t motivate, but this approach might do just that.