The idiom "the reason behind someone's success" refers to the factors or causes that contribute to a person achieving their goals, overcoming obstacles and attaining prosperity. Full definition
Emerging young and fresh talent is a fundamental reason behind the success of the industry. (stylesgap.com)
My ability to make independent decisions, working with minimum supervision and taking criticism positively has been the prime reasons behind my success in the educational arena. (coverlettersandresume.com)
The main reasons behind its success was its feather like weight, tipping the scales at 67 kg, it is no wonder this is the world's lightest internal combustion engine. (topspeed.com)