The most promising coins that can give good growth are those coins behind their backs that have a working business. As a rule, such coins grow in value, but there are projects that are trying to change the world for the better, such projects can also be successful, for example #swachhcoin. The project will pay people for their trash. At the moment, the bonus is 5%, you can buy coins by the end of October. I advise you to see the project.