Clarification needed on what you mean "doesn't focus close enough".
Do you need to zoom in from afar more, or are you too close and it won't zoom?
The former might suggest something like a 70-300mm might be a good buy, but the later might suggest you could do with a macro (micro) lens of sorts.
Or do you just need something with more range, in which case as already suggested the 18-55mm or 18-105mm would be a good starting point