Small Cell in a Huge Ecosystem

A normal ten year old boy dies while playing with his friends by a river. He is sent to a place that is neither heaven nor hell, and is given a chance for reincarnation. Unfortunately, out of the thousands of organisms he could be reincarnated into, he is reincarnated into the smallest and weakest one - a bacteria cell. God, having pity for him, gives him the chance to become something better.

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This is my first attempt at a story, so there will be a lot of errors and failures with it, but I hope you will still read it and help me to get better!

Although the story will start off with a singular character, once he evolves from being a bacteria I will introduce more characters.

I am not a biologist, so there will probably be a lot of errors with this story, so please feel free to correct my misunderstandings!