If you need to increase your caseload size, take a look at your threshold for mid-level. Say you’re defining mid-level as those who’ve given $1,000 or more. Try bringing that down to $750 or $500 and see how many more donors that pulls in. Or if your caseload is too large, you can select donors to remove based on who hasn’t given in a long while, who’s giving at lower levels, or for whom you don’t have good contact information.