Refinement

I need some help sorting out the bass and the drums for this track. Any guidance would be appreciated! :)

Additional info:
The song has less than 10 tracks recorded that need mixing. . I don't have a hard deadline for this. I need the mixer to do some editing, time aligning and vocal tuning before mixing. I'm hoping to find a good mixer that can work with my limited budget. I'll need you to master it too if possible.