A sample of your recording or familiar song may help.

Some find the PGReverb serviceable, for my voice I prefer Ambience (free downloads available).

Also the compressor will have a bit to do with it also. It will directly affect how the reverb behaves.
Tinkering with these two plugins you can learn a lot.

Another common thing on commercial recordings is to double the vocals. Either by singing twice, or copying the existing track to another, and sliding it ever so slightly out of sync. You'll have to tinker with that on your own to find out how much; it's different for every recording.

Also, you may want to move the reverb to the AUX slot in the mixer, and then use the AUX send dials to feed the signal to that effect. This way you can run one reverb unit for several vocal tracks..

Sending a well-EQ'd vocal to the compressor to begin with starts the whole thing off..
All of the plugins relate to each other. It may just be that the preset isn't working well with your voice. They are only meant to be starting points. Pull the bottom end right out of the EQ to avoid mud, maybe boost around 2-2.5 kHz for a little clarity or intelligibility.. experiment and have fun

I do not work here, but the benefits are still awesome
Make your sound your own!