Dragon Ball: the Strongest Saiyan

In a simple summary, it is the growth story of a Dragon Ball fanatic who travels to the Dragon Ball world and becomes a Saiyan, a fighting nation in the universe. Let's start with Frieza's arrival on Namek. The protagonist's power will eventually surpass the Super Saiyan God, defeat Beerus and kill Whis. The original work will be slightly adapted, but it won't be too unreasonable, with only a little bit of the butterfly effect. I've only seen some of the theatrical version, so I don't really understand it. I feel free to criticize the unreasonable writing, but point out the mistakes and stop talking nonsense. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.