We encourage you to apply to multiple networks. If you aren't getting approved, there may be a reason for that. Example: you aren't being proactive after submitting an application by calling the network.
Most offers DO have urgency in them, you just have to think about what that would be for each offer as if you were the one that needed the offer. What would make you need it, right now? We do offer review requests (when properly formatted) to let you know if it looks like a good offer to run with call only Ads.