if it gets lost in the mix, it can only be because other elements are coming in (or rising up dynamically) that mask the freqs where the bass otherwise cuts thru.
you have several options. the first is to find these competing freqs and cut them, just enough that you get a sense of the bass back. i say 'a sense' because it may well be appropriate that there are times when the bass is merely felt and not so distinctly heard. the denser a song gets, the more this is true. pull your focus back from the bass and hear the song as a whole, what does it need?
your second option is, as others have suggested, use processing such as eq, distortion, and compression to excite higher freqs in the bass, which will allow it to cut thru a denser mix. a little goes a long way here.
your last option, which is the simplest, is to just ride the fader with your finger or your mouse, and automate that puppy. watch for low end bloom.
my guess is that you have some combination of masking and arrangement issues going on, which brings me to another option: the mute button. things may be coming in that step on an otherwise perfectly good arrangement. do they need to? are they serving the song, or just a musician's ego?