what's the best job to earn lots of money?

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Right now, I'm working as an online English teacher to Koreans. I also applied for another job which is only part time, and there I will be teaching Koreans man to man. I really need to earn more money. I have been working for almost seven months and I haven't saved any, just a few cents I earned online. I don't know what's wrong. Maybe the pay is too low, or maybe I speand too much. I always end up penniless after just one week. Maybe I'm helpless, anyway, I'm really determined to earn. I just need more effort and skills. With good skills, comes more opportunities! :)