How do you get deadly xin levels on grand theft auto Chinatown wars for ds?

To achieve deadly XIN levels in Grand Theft Auto: Chinatown Wars for the DS, you need to focus on completing specific side missions that increase your drug dealing skills and reputation. Engaging in the drug trade, particularly with the right combinations of drugs and quantities, will elevate your status. Additionally, using the right vehicles and weapons during missions can help you maintain a higher XIN level. Regularly interacting with contacts and completing tasks will further enhance your standing in the game's criminal underworld.