Can anyone suggest me how could i upgrade my Bitcointalk rank? 
Join and participate here in forum, start making quality post and answers in different question regarding about crypto topics, and one thing that i see is you have to get a merit to upgrade your rank and it is difficult to get.
It is hard to rank up from member and gonna stuck at Jr member as you do not share knowledgeable post in the forum though it only need few merit to become member. You have to work hard and learn more to get rank up unlike before that you need to update your activity. There many campaigns that offered also for Jr member. Do not stop until you earn. Just enjoy and be serious on what you are doing.