Although I'm not on here for the money I do know that this, like a lot of things, is a numbers game. You've made a good start as your work is of a high standard both in content and layout. You can go the shotgun approach which is quite productive. Follow as many other accounts as you have time to click on. A percentage of them will follow you back and that will increase your potential readership and rewards. There are more targeted ways to increase your income and you'll find a lot of them on here written by relatively big earners. Good luck but judging by your work you won't need a lot if any.