Thanks for your service to the community.
One good thing is that in regards to:
"I greatly enjoyed cleaning up old questions, getting popular questions answered, and bringing more traffic to Chem.SE which were my primary goals as a moderator."
all those things can be done without a diamond. So stepping down wouldn't have a huge impact on your "goals as a mod". However I also totally understand if those are things that you no longer enjoy doing.
I'm curious to learn more about the drop in interest from the members of your FB group, which you mentioned recently on a comment to one of my posts, but that's not so important here.
Thanks so much again!