Reply to Mastering songs

Hey DJ Techtoolers!

I am really into producing at the moment and really getting my flight-hours lately. But at the end of the song, ofcourse it needs to be mastered. Not yet very good at it.

Could you guys give me some pointers to make this remix sound better? Just some general tips and stuff I might have forgotten! Thanks!

https://soundcloud.com/risc12/will-i-am-britney-spears