Quit or Back Out of a Regular Commitment You’re Not Getting Value From Anymore
I'm trying to find more time in my schedule for [first good reason] and [second good reason].
To help make that happen, I'm going to bow out of [the commitment you want to back out of] completely.
I've gotten so much out of [activity type] in the past, and I really appreciate [something you really liked about participating]!
If ever I can be of help, please let me know! I hope I bump into you all from time to time [online at the office whatever].
Sincerely, [Your name]