Actually, protein is not all it's cracked up to be. It's hard not to get "enough," and many people get excessive amounts (which can lead to leaching of alkaline minerals like calcium from the body, kidney stress, and immune system stress).
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To build more muscle, you do need more protein, but because you need more calories as well, you will automatically get more protein (unless you eat mainly processed foods and/or citrus fruit). To get lean, cut out processed foods, especially HFCS, (partially)hydrogenated oils---or any added oils for that matter) and stick to a clean diet, and add some interval cardio to your workout 1-2 times/week.
What will build muscle is WORK and calories.
Also, quality of protein is important. Something like hemp, for example, is an excellent protein because it is easily assimilated and has all the necessary amino acids.