Credit card usage

This is my first time using credit card (Standard Chartered Bank Pakistan). Its been a year i am using it. ( i don’t have a proper understanding of it) but least i know is pay the bill off before due date which i always do. Now the thing is, i get the annual fee on it which is like 25k. I called their customer support and they told me that this is my first year and if i avail my credit limit in 3 months, they will wave off the fees. I am planning to block it after sorting it out fees and all.

Someone suggest me if i should do it or continue using it? What’s the benefit of keeping it and everything.