This Guy Doesn't Cultivate Immortality

Why do the people from other worlds that the protagonist travels to have poor IQs? Why does the protagonist forget his previous life and become heartless when he travels to another world? Why do you still make enemies for women when you are in a high position in another world? The purpose of this book is to write something different from the traditional ones. To put it bluntly, I am a 10-year-old bookworm who doesn't want to read such a book, but has no books to read, so I want to write it myself.