Modpacks can take quite a while to be reviewed depending on how many staff are working at the time, and how many they have to go through. Just be patient. If it isn't approved or rejected within a week, open a ticket with support. Cheers!
Almost all modpacks do get approved at some point. It may take anywhere from hours to days. The modpacks take much longer than mods on this site to review, so just be patient and it should get approved as long as it follows the guidelines.