How do you become good at sculpting?

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I know this is a stupid question, but I'm a 2D artist and trying to learn zbrush because all my previous clients dried up because they want zbrush models.

I was trained using Scott Robertson DVDs plus I went to his lectures and I pretty much just practice what he taught until I became good.

Is there a good sculpting books that have exercise that build up to becoming a good sculptor?

Sorry if there isn't. It just I'm a bit stuck and I've been looking at sculpting books and they all seem bad. For example, Edouard Lanteri has some exercise but the book is rubbish.

If I had a time machine I would go back in time and kill the person who invented zbrush.