Don't be too disheartened if you get denied. Keep contributing to the community, keep showing a clear understanding of the rules, keep up reporting rule breaches and remain an active, positive force on the forums. In the future the admins may reconsider you, if you can prove that you are what they're looking for. They always need more moderators, but they have to be able to rely on you to keep to their standards.
He is right. Just keep on using the forums the way you did before, contribute more to the community, and try to always improve the quality of your posts. There is always next time, and who knows... you could be the next moderator when the time is right. Keep your chins up!