Congrats on 3 years sober! Awesome work.
I dont know much about the alcoholic mind as I think this is a part of AA language or the program. I do think you have the feeling this restlessness may have something to do with your spiritual growth. I did experience a restless feeling after quitting on many occasions.
For myself, I have to take care of my spiritual, mental, emotional, and physical body every day. I find a lot of stability when all of these are nurtured or rather when I am in a Growth Mindset. It looks like:
Spiritual practice when I wake
Gratitude Journal and journaling
Exercise daily
Reading literature or talking with trusted people on topics of interest. Mental stimulation.
I also think we as humans go through seasons, alcoholic mind or not. We can get restless. We can feel like something is a miss or missing. This is a part of the human experience, in my opinion.