For Facebook being the biggest company, they are the worst at customer service.
But here's a couple of things you can do in the meantime.
Prepare and create a brand video ready for when you get approved. Please look at this guide for some tips.
Email Marketing is a good one. Setting up automation for sending welcome emails once a user signs up is a great idea! We really suggest creating an email a day to promote competitions.
You can create a template which you can use for every single email plus it makes everything look cleaner.
You can schedule emails weekly which means there is no need to fuss every day.
SMS marketing once a week once you've built a little more of a user base. Per segment texts are about 4p so keep your messages short and include the link to the comp.
We would suggest only using SMS for the bigger comps.
Giving free entries/credit to loyal users who have been playing for a couple of weeks.
Quick Payouts always help to build trust and for your players to know you're on it.