Hi,
if you're at 24 bit you can leave it as it is or turn it down with a gain plugin or use the output level of one of the master bus plugins you use.
If you use plugins that are dependent of their input level you shouldn't edit the waveforms as that would change your mix (e.g. change the way the compressors react or giving you less saturation).
If you're still at the stage of gain staging it's one way to go. Or reduce the volume of the busses you use or the volumes of the single tracks.