Of course, it can be very difficult and sad to leave your job, but when you need to earn more, or relocate to other city or country, you have to do it. The other difficult thing is to find another  job, for this you need to prepare a good resume. The service resumeedge.com/cover-letter can be a good assistant for you, as they have a good experience in resume and cover letters writing, so their help will increase your chance to get a job.