You submit to the new Jin emperor. Other steppe leaders lose respect for you in doing so, and the the emperor keeps raising the tribute your tribe must pay. Due to not having the trading partners you would had you built an empire, your tribe falls into ruin and is eventually absorbed into a rival tribe. The greatest empire the world has ever known is never built.
You chose a non-historical decision! In real life, Genghis Khan likely never would have submitted to the new emperor. He had no respect for the man, but also he and his generals had already been plotting and planning an invasion of the Jin empire. Read more about how your decisions differed here.