How can I earn more money?

Hardworking,trustworthy,must be have good manner to all

You can do that by starting your business either full time or part time..Also investing your savings in cash producing assets makes you earn more money but you need to do your due diligence first to pick those assets. 

it's Depends on your field ... but best way to work freelance beside your work 

There are different methods for various businesses. In Telecom, corporate, retail sale, in MFS its retail sale & purchase, corporate and multi channel payment methods and platforms, in FMCG, small, medium and large scale stores etc. However, management method for money / budgeting will plan directly proportional to the  business growth. Moreover, it is bit sensitive to explain ahead of this point because exact business known can have exact solution to be implemented.