Hello,
First, congratulations on three months of sobriety.
Recovery is definitely more than not drinking, it is about getting the most out of our lives. One thing that has helped me this year is nindfulness. I have been staying focused on the present, and also being grateful for the moment. You mentioned that walking no longer brings you pleasure. That is a great place to start practicing mindfulness. Try taking some time to just enjoy the beauty of nature. I know it may sound kind of cheesy, but it really does work.
There are lots of great threads on here about recovery, spend some time reading some abs see what will work for you.