Hi @huongvu! I do not think there is any specific answer, just general one - a good content quality. You will hardly earn anything on just one photo and little of writings, especially at the beginning. Explore around, that's how you will learn the most. For many of us, Vietnam is an exotic country, so why not to write about some place and post it along with 5-10 photos. Or whatever that inspires you in everyday life. There are awards for science, art... and also plenty of contests for most different things... Right way is to write meaningful comments in order to become more visible. Good tags can help. And of course, frequently posting. People who have a high payout usually invested a lot of time in the Platform - don't forget that! Good luck!
P.S. Write about your New year and show s how you celebrate it!