Just because did not go with my account in Sr member. I have 658 activity why did not rank up? Its un pair with us if merit.
You need 149 more Merits to become a Sr member mate and you can do it

I started from 0 merits but now I have 143 merits without even so much effort... so if i can, then you too can do it.
Never be discouraged because of merit, just discuss with people and contribute to the forum.