Maybe you've experimented with a few audio / video editing applications and noticed some applications have a default FX chain on every channel?... usually at least an EQ, and a compressor. Apparently, that's a big step towards best-practice mixing technique. Applications like iZotope's Alloy are even designed to have a plugin instance placed on each track in your audio project. It's an EQ->Transient Shaper->Harmonic Exciter->Dual Compressor->De-esser->Limiter chain, with a thorough description of the appropriate use of each in the User's Manual. As a beginner, it can serve as a checklist of tools (in a logical order) to consult first before wading through your library of plugins without a clear direction.
You might be hard-pressed to achieve presence in trying to "correct" the mix with plugins. Consider the arrangement as well. If you can place additional instruments in the mix (positioned in the stereo field to separate them from other voices) without clutter, it'll sound more natural than boosting levels.
Chorus can be used to emulate the sound of multiple similar voices with simulated variations. Reverb adds space to a mix... used well, it can emphasize the presence of significant parts and also heighten the contrast between the foreground & background elements (3d mixing:
http://www.soundonsound.com/sos/1994_articles/nov94/3dmixing.html). In doing so, the clarity gained adds an intensity to the overall sound.