sir i came visit in dubai but now three months...

If you want to leave the UAE before the visa expires, here is the following information:
You must contact one of the airlines to book your flight ticket. If you encounter any problems that prevent you from being allowed to leave the UAE, you should contact the General Directorate of Residence and also the embassy of your country for coordination to allow you to travel.
Your country's embassy will assist you in leaving the UAE before the expiration of the visa