I usually keep my SD starter in my fridge, take out every 2 weeks, pour off alcohol, mix, pour out half, and feed with 1/2 cup flour and 1/2 cup water... The last few days, I have been trying to get some activity out of it, so I have been feeding it every day and leaving out of the refrigerator, but I am only getting very little rise after a few hours, is the starter dead? Any recommendations on how to give it new life?