Running a successful dropshipping business can be done with proper marketing and promotional strategies. But niche/product selection is always a tricky part.
Here I am not going to tell you how to select your niche or which is a profitable niche.
But i am going to give hints that you can consider to select a niche in a smart way.
On the other hand buydropshipsite already has pre made dropshipping stores for sale by considering all the points that I am about to give.