From the UK and the US: I Play the Role of a Honkai God to Reduce My Dimension.

The protagonist Lynch accidentally travels to the British and American world ruled by Bai Chao's high-pressure, and is bound to a system that requires completing "role playing" to become stronger. He chose to play [Sunday] and use a month to make the world believe in the existence of "God". When the heroes of the original world arrived for the decisive battle, he joined the battle as a "third party" and used the power of "order" to reduce dimensions and attack Bai Chao at the critical moment, and then "died" and disappeared. Not long after, at the interstellar concert in the original world, the talented singer [Mockingbird] appeared.