Look at your package with fresh eyes

Is there a niche market it may appeal to that you weren't intending? (Example, a Change of Address program targeted new movers with a namestickers package, however the creative featured birds & flowers—bird watching publications worked great!)

If you've saturated your core market (as many fundraisers have), test test test outside the box. Most offers will appeal to clusters of demographics (the premise of modeling), yet so many mailers focus on the largest, most profitable cluster, and leave the rest out. Set aside a separate, small budget for testing, and pick a handful of markets, and test at least one from each on each campaign. Test at least three lists in a given market before discarding it.

When testing, push for the most targeted segment with an aggressive test incentive. List managers often try to get you to test looser segments, (because when you start with say a 3 month $25+, it can be hard to get you to roll out to a greater recency or smaller dollar). If the manager is at all hungry for new tests, they are often likely to give you the best deal on a one-time test incentive, so it can be your best chance to get the strongest segment without paying through the nose for it.