Ok, you’re looking for some mixing and mastering stuff. If you want to improve your mixing and mastering skills you shouldn’t use Audacity to add some effects, instead you should improve the mix in Renoise or whatever you’re using with the right tools and methods. Check this. I’ve listened to your song again at home through my studio headphones and through my common hifi speakers. It’s very boomy, you should clear all the unnecessary frequencies in every single track first. Once you’ve done that you can adjust the volume of the instruments (I would recommend mono mixing), apply some parallel processing stuff and finally finish the mastering. Don’t forget the limiter in your master track. 
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