Fine Tuning a Paywall

I'm working on my App's paywall. I'm curious what everyone's thinking is on this topic. Currently, my app requires users to register and subscribe for a 30 day trial - that they have to cancel. It is clearly a barrier since I've had so few people even subscribe (about 25 in the first month) - while getting 700 views in the app store and 172 downloads. Is it better to offer some free without subscribing usage? To get an a-ha moment before paying? Thanks!