What career would Louis have chosen if he were not part of the biggest boy band right now?

He would have been a Drama teacher if he hadn't become part of the biggest boy band in the world.

In future, he aspires go into music industry and scout for talent like himself.

He would have been a Drama teacher. He even acted as Danny in a Grease musical at his school.

he apparently wants to go into music business

He has created his own record label with Sony's backing. Amazing !

I think he would choose a career in football ..
He loves football, and that would be his choice.