My Activity is stuck don't know why 3 days or more may be its not increasing.
That is not an issue or a problem, here is the reason why it seems your activity is stuck:
Why is my activity stuck/not moving?
Because you can only get 14 activity every two week period. You will have to wait until the next period starts to get another 14.
So all you basically have to do is just wait and continue contributing on the forum as normal, when your next period is complete, your activity will be updated, if you want to know all about activity, check this thread:
https://bitcointalk.org/index.php?topic=2766177.0