Need advice.

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I can sing in a high voice, but I would like to be able to sing in a low voice and kind of screaming. I mean the style you can hear in many metal songs. I can scream, but for short time, then I kind of lose my voice. I'm not kind of professional singer, I don't take it too seriously, but I just would like to try singing in a different way if you know what I mean. So perhaps, anybody could give me few tips how to practice to be able to sing like that?