How to increase the visitor traffic your website can cope with
There are two main areas of considerations that affect the amount of simultaneous web traffic your website can handle.
The first would lie in the technical configuration of your hosting service, and to some extent you will get what you pay for in this respect, so it is worth shopping around for a hosting package that meets the needs of your website now and in the near future, allowing for expected growth in web traffic and active users, but without costing you more than you actually need to pay to meet those needs.