If you want to learn how to sing like Randy Blythe from Lamb of God, you need to focus on developing your techniques by strengthening your chest voice, practicing false cord screaming and guttural growls, improving your posture and breathing, and practicing Lamb of God songs.

To build your chest voice, you should practice exercises like humming and singing in a higher range using your chest voice. False cord screaming can be learned with Singing Carrot's "How to Growl Exercise". Singing Carrots also provides resources on posture, breathing, and breath support in articles like "Breathing basics" and "Breath support".

You should also consider practicing some Lamb of God songs to fully understand how Randy Blythe's style works in practice. Singing Carrots provides a songbook and search feature, "Search songs by vocal range", to find songs that match your range and difficulty. Singing Carrots also provides range and pitch tests as well as a pitch monitor to track your progress.