to become a Jr. Member you need an activity count of 30, and you only get 14 activity every 2 week and today at about 3/13/2018 19:40:00 the activity will reset. to increase you activity you need to post once every day for about 6week.

you can always track the next activity reset period in this link : https://docs.google.com/spreadsheets/d/1dDySMB2lsOIIkUXuax2rXL30gv656E4xTsFcC2zQHkg/pubhtml

and if you need to know when activities and ranks are counted refer to this thread, you would find all the info you need : https://bitcointalk.org/index.php?topic=178608.0

Regards.