Today, Niantic announced on the @INGRESS twitter account that they would be adding 7 more portal submissions to your current submission queue. So get out there and submit some more portals!
If you are below level 10, you will be able to start submitting portals for the network once you get to that level.
Agents,
Thank you for your feedback on the Portal submission and review process. The Portal network has been growing in large part thanks to your submissions of new candidates. Starting today, you will be able to submit up to 14 Portals within a 14 day period.— Ingress (@ingress) March 8, 2018