I working on 7 songs but one is coming out as a single and I want you mix it

The song that I want you to mix first hiphop and a traditional Ethiopian drum pattern. I have 25-30 stem files. The release date that we planned is Jan 20. The arrangement is good but I haven’t started any mix on that. I also want to know how much you charge for 1 song to do the full mix? Thanks

Additional info:
The song has somewhere between 10 and 30 tracks recorded that need mixing. The tracks are cleaned, tuned, and and the song is ready to be mixed. I'm going to hire a different mastering engineer. I'm interested in working with a very experienced mixer. I don't have a hard deadline for this. .