First off I’m so sorry about your losses. I can relate and used drinking to cope with the loss of my father and brother. Even tho in the end it only made things so much worse, and so much harder.
Desperation was what I needed to get sober. I almost lost my marriage and my children. I had never been more desperate in my life, and I knew at that point I would continue to drink my life and family away, or I would get sober. I have 7 months sober now. For me, all the bad and the drinking that was happening in my life, now serves a purpose to keep me grateful and thankful for this second chance at life sober.
I know you can do this, for yourself, and for your niece. Sending love.