The time I was ennobled and saw Emperor Jing in Tianxin Hall, I could have shouted 'Your Majesty, I have an important matter to report,' but that would have been quite abrupt, and whether he would listen or not was another matter, because that was purely a projection of a part of Emperor Jing's spirit.
In short, the two aforementioned methods are the regular and reasonable, cost-free channels.
However, as the Heavenly Destiny Mysterious Bird said, there are too many variables.
If the report reaches a king like Luo Hou King, that's still fine, but if it gets into the hands of someone like Prince Liang, it's akin to delivering oneself to one's doom.
"So it seems, the guy from my previous life who was ennobled as Marquis Xian, finding the opportunity to meet Emperor Wu, must not have been possible without the indication of the Heavenly Destiny Mysterious Bird..." Zhao Xing thought to himself.