Yea Pro Tools user here. What you wish to do is part of something call Mastering. Mastering has got many stuffs, so I shall not go into that. You shall do your own research. However, if you merely just wanna boost up your level, the most easy way is to use a brickwall limiter/maximizer. Personally, I don't really use alot of Pro Tools' default plug-ins. I uses mostly three party plug-ins. And I don't remember Pro Tools installer comes with their own default brickwall limiter/maximizer.