Of course all of us what to level-up, all of us coming from newbie but we got this position right now because of having activities. One post consider as one activity but there is a limitation of activities per 2 weeks, its only 14 activities. Even though you have 15 post within 2 weeks its consider also as 14 activities. As you rank-up the more activities you got.
You are right, we all want to rank up, but before that you should wait until your activity is enough for the rank you want, it is not difficult to wait, especially if you are waiting for a good start. Make sure that everyday you post atleast once.