The equation formula of ammonia from nitrogen to hydrogen, how will increasing the temperature affect the equilibrium

Higher temp faster reaction. Lower temp slower reaction.

In order to get as much ammonia as possible in the equilibrium mixture, you need as low a temperature as possible. However, 400 - 450°C isn't a low temperature!

The lower the temperature you use, the slower the reaction becomes. A manufacturer is trying to produce as much ammonia as possible per day.