Hi, Brian- and welcome back
I'm exactly on your timeline, about to hit 16 months also and admit that I also feel a bit flat, blah, not really in that sweet spot I was a few months ago. However, I do think that I couldn't have sustained that level of GLEE forever, and think I'm just settling into a baseline of normalcy. It's not bad- it's just kind of.... there. Learning to live with "normal" is probably the best description. I think you're smart reaching out- coming back here.
Congrats on your sober time- I'm sure you will be welcomed back with open arms. We all make mistakes, we aren't the mistakes.