Creating simple but mild melodies for mobile game

There is already a ready text for a song in one project. You need to create a backing track for it and adjust the lyrics. We tried creating it through AI, the result was very terrible. I will send the text in a private message and we can continue discussing the project there.

Hello. There is a track of 2 minutes, it needs to be extended to approximately 3:45. The music is needed for a circus act. It is preferable that the performer is familiar with the concept of dramaturgy. There should be an introduction where the artist appears, moments of silence, a climax, and an ending with a point. It is desirable to maintain maximum similarity to the original, or at least the vibe and mood of the music. I don't know what the correct term is among musicians, but in our circles, we say "rewrite the music." Perhaps someone has done this before, I would be interested to hear examples. Please suggest your price for the work. Thank you all.