You are not alone. A while back all Jr. members with 0 merit were demoted. Now you need at least 1 merit to rank up. You can read more about it here:
https://bitcointalk.org/index.php?topic=2818350.0Looking at your post history, it might be difficult for you, as you have mainly just made bounty related posts. Engage in quality discussions without worrying about merits. That way you have more chances!