Do a twitter search "doing a poll". People who are thinking of running a poll, give them an option to do so.
You can use Product Hunt to create an Upcoming page. Build an email list and offer it to beta testers :)
@nathanielchen1 I built an upcoming list - producthunt.com/upcoming/poll… - the tough part is getting subscribers :p
Are you willing to spend money? You can incentivize users with contests/giveaways that are promoted via paid ads. You can also try to ask your own network (friends/family/LinkedIn, etc) and their networks for feedback.
👋 Join WIP to participate