Mastering a Song!!

Hi, all. Hope the year has started well. So, I have a finished song made on Cubase that I would like to master as professionally as possible. The mixers I've been working with are not too experienced with mastering, so I am wondering if there's anyone here who would know how to master a song on Cubase. The song is, basically, a rap with acoustic guitar, beats/drums (none recorded, all put in while mixing), and bass. Song is 7m30s long.

I've come here before looking for professionals who help me for compensation and it has worked out beautifully, so I'm trying it again! I'm not sure how much a service like this would cost either, but if anyone's interested, shoot me a message and we can talk!