How can i improve my hashrate mining rvns?

Hi guys, im a newbie miner from Brazil.. i have Just a msi rx 560 4gb and i have a 4-5.3mh/s hashrate on flypool..

Theres a way to getter a better hashrate? 🙁

I saw rx550 with better hashes than me and i dont know what tô do.

Sorry for my english