How to get more client to buy my service

How to get more client to buy my service

Hi,

I want to know how to get more client to buy my gig or increase your sales.
Is there any promotion or advertising method used by top rated seller on seoclerks to increase their sales.

I am level 2 seller but I am not getting enough sales,just few sales every months.

If you can share with me, then It would be great for me.