Minecraft not working for iPhone 11

Hi there! My name is Katie, 

Every time I open the latest version of the Minecraft app on my new iPhone it freezes on the loading screen. I am currently paying for a realm my friends can play on, but I have no access to it. I've tried uninstalling and installing Minecraft again, restarting my router, restarting my phone. It has only worked once and I've had this issue since. This is so frustrating! HELP!