I had hair transplant 9 months my crown area growth is very slow, My earlier condition was same, is there anything I can do?

It can take 6 to 12 months after surgery to see results.  If you are concerned it is best to contact your doctor

I don't know how many grafts you had done there but if this happened to you the last time, I suspect the same course will be seen this time as well. Did you have enough grafts to really cover the balding crown area?