How Can I Soften Suspension on PPV Tahoe?

[A123]

Hello,
I have a 2010 PPV (EX-Police) Chevy Tahoe and would like to soften the suspension because it has a very harsh and has a stiff ride.
I would like to make my ride quality like a 100% stock Tahoe and would like to know what needs to be replaced/changed to do so.

Please let me know if you know anything about it..

Thanks