Hoi, I've been mastering songs in my free time for about 2 years now and I'm always trying to improve. Therefore I would like to master a song really cheap for you.
The mastering will take about 1-3 days, depending on the efforts and my available time. I master almost all common genres but I am more focused on rap, hip hop and RnB.
To prevent any misunderstandings please make sure you read this if you dont know what mastering is:
https://en.wikipedia.org/wiki/Mastering_(audio)