I'm sorry for your loss. I've lost friends in sobriety, but after the initial mourning, and I mean not soon after, I was able to rebound and get back to a regular life.
And by regular, I mean with a hole in my heart and feeling like a piece of me is missing.
I still feel that way after a few years. Their loss changed me, but I remained sober.
My advice would be to take your time and heal. I know how hard that is, but it's nothing picking up a drink will make better.
Best to you and you have my sympathy. You're not alone.