What do I do next with my terminal uncle?

My 96 independent uncle lives alone. He has dementia and recently was told he has terminal cancer. His personality is up and down and for the most part I could just walk away when he got out hand. His needs are increasing but he does not want outside help. I am not sure what to do? I am his main caregiver but I am limited myself and can not take care of him on a full time basis and barely on a part-time basis. Needs to focus and direction.