re: 135 days since I was saved by the Grace of God through faith in his son Jesus Christ

IMO it's not so much a plan but a purpose. The plan is the vehicle to achieve the purpose. I believe that it's someone's time to die only after they have completed their purpose. Some missions are short and some are long. God doesn't cause death, he allows it because the person has completed their purpose. The purpose could be as simple as saying something or doing something that sets the intended on their destined path. I believe God puts people in the path of others (the plan) to help them complete their purpose.
For example, a storm causes the power to go out and a man wakes up later than usual. As he walks out of his house he notices a child chasing a ball in the street. He also notices a car coming down the street. He races to the child and pushes him out of the way. The man is hit by the car and dies, but saved the child. If the power hadn't gone out the man would have already left for work and wouldn't have been there to save the child. IMO the power outage was the plan and saving the child was the purpose. It's all about perspective. Christians walk by faith because we are not all knowing.
You can ask all day long, "why do children die" and the question will never be answered for those that are left behind. It's not our purpose; It was theirs and they alone will be answered. Perhaps you should seek your answers from God himself. You don't have to believe in him to seek answers, but you do have to ask with a sincere heart. Of course, you have to be willing to hear him.