The team is full of girls who are single until retirement based on their strength

After the hero speed-runs through the alternate world, he has no more strategies and can only retire. Can an ending without a harem and only defeating the boss be considered a grand ending? What? You said you like me? Impossible? Hey, hey, hey, there are strategies for killing monsters, but do you have any strategies for falling in love? (ps: The above plot is pure nonsense. The author wants to show a real alternate world so that you can have a better career guidance after traveling through it. The plot of this book is slow, and it is impossible for a single female protagonist to develop it anyway)...