What would produce the most uneven but earthlike planetary surface?

What planetary parameters such as plate tectonics and volcanism etc would best encourage the most uneven planetary surface on an earth like planet?

I want a world to be covered in very uneven terrain, the more precipitous the better over 90% of its surface whilst still providing a good place for humans to live or at least without it becoming uninhabitable for humans. How might this realistically come about? The world must be approximately earth-like, but planetary parameters can be changed within these bounds if it helps.

The planet may have seas but these should be broken up and dispersed and covered with mountainous islands.

The best answer will have the most uneven terrain over the greatest proportion of the planet.

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What would produce the most uneven but earthlike planetary surface?

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