How to find a reliable patent agency with appropriate price?

The agency doesn't want to take over this halfway, because if the application documents you submitted before are of high quality, you won't want to go to the agency. The reason why I want to be an agent must be that I have no confidence in the previous application documents. However, if the application documents are rejected or a notice of examination opinions is issued, it will take much more energy, time and workload to respond to the notice of examination opinions or file a reconsideration than to submit the application documents from scratch. No organization is willing to accept this kind of work, and no one is willing to do it unless you add money and don't add a little.