Best work schedule being a full time college student (16 credit hours) ?

I’m currently only taking one class this semester and I have three days off currently and I still am behind usually a little bit. Next semester, I will be taking full-time 16 credit hours. I will be taking all junior level courses and I feel like having four days off is still going to not be enough for me to be able to handle. how many days do you usually work when you are a full-time college student at Walmart, should I do morning shift? What should I do? I don’t know. I’m so lost. I need to change my availability as soon as Thursday of this week. (Today is Wednesday lmfao)