Increasing Traffic

I'm trying to find some new ways to increase traffic significantly for some of my campaigns while maintaining a healthy conversion %. What we are using now is already successful, we just want to push it more. We are already running during business hours and a little over (because we don't do well in the night hours - because its an ecommerce site).

What are some new ideas to push what already works? Creative tests? Special promos? Anything else?

so you want to increase ppc traffic only

- I would check out your theory on the nightime, so you turn your ads off at night, unless you have a phone number so no one would be there after hours, I would turn that back on.
- what about the East Coast and International, diff timezones, I run at night, YES my conversions are not NEARLY as high as they are during normal hours, so my margins are VERY TIGHT AT those times, and sometimes I actually dont convert, but around 3am, east coast kicks in and im back to converting at great rates, Why would I run if im losing money?
Branding, lets say im in a telecom biz, I want everyone searcher to kno when they look for phone equipment that my site will be there and I have the products and services they need and are looking for and that no matter when or where they search that my company will show up and that we are here to stay.
-2 I would suggest trying new channels or search engines, try out some 2nd tiers
-3 Optimize optimize optimize, keywords bidding strategies, ad copies etc.
4 - how are your google quality ratings, are all of your keywords active?
but id say most of all look for new sources of traffic, hope that helped