How to increase sales? Improve profit? Please give me suggestion… Please share your experience
That’s a little thin to go off of…
What do you sell? How do you sell it? What makes you different / unique / special?
If you want to be that general, I’ll be that general as well: throw money at advertising. 
It is not the best way by throwing money on advertising, you have to become smart on this.
Like to select the area of your things your sell, analyze the customer and its behavior and other points.