Related advice: if your equipment supports ducking, use it to duck competing instruments under the vocals. Even a couple of dB makes a huge difference.
Ducking is the reduction of volume in one track/instrument so that another can be heard over it. At its simplest it can be done with a bog-standard compressor on the track to be ducked, using the vocal track as a side chain. You don't need to use fancy ducking plugins; I don't.
Consider ducking any instrument that occupies the 200 Hz to 3 kHz range, like guitars, pads, pianos, etc. because those are the instruments that will compete most with vocals.
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