Once you have a list of simply these donors who you want to mail to, separate them based on their last gift measurement. Then you’ll be able to request a slightly larger present in your letter and try to upgrade them. This system works very well and is easily accomplished via mail merge.
I once worked in a nonprofit the place one different person and I shared all the executive and fundraising tasks, and among the program duties. It wasn’t straightforward. However it did teach me that I HAD to prioritize my “to do” record and focus on these things that will carry me probably the most bang for the buck. What I discovered pretty quick was that spending most of my time on particular events was not the most effective use of my time. Making thank-you calls or taking major donors to lunch was a much better solution to …