We have renewal templates for: 90 Days Out, 15 Days Out, Day of Expiration. Trying to write a membership renewal letter but don't know where to start?Optimize your member renewal letters to keep members coming back year after year. Read our how-to guide and download your free template. A formal letter for a membership typically follows a professional format and includes specific information related to the membership application or request. Learn effective membership renewal letter strategies with guide and samples. Improve member retention! Here are 10 things your welcome letter or email to new members must include plus a template that can be customized for your organization. A great membership renewal letter can convert members who may be unsure if they want to remain. 1. Enter the date at the top of the letter.