Going from a 3" lift to a 6" lift???

I currently have a 2011 TRD off-road with a complete toytec BOSS 3" lift with adjustabe coil overs and LR UCAs in the front and Dakar leaf pack in the back.

I feel like the 3" lift get to normal too fast and have been contemplating going up to a 6" lift..

Can I still use the majority of my current 3" lift or will I have to take it completely out and replace everything with a 6 inch lift???

If the answer is swapping everything and hoping to sell the current lift I have on now, then I guess I'll just keep what I got...

I'd love to the answer to only have to buy and piece together what ELSE I would need to make it a 6" lift, and if that is the case how do I do about piecing together only the components I'd need for the added 3"??

 

You might be able to do it with blocks, but that would be one nasty ride.

Body lift is another option, but I've heard that isn't the best way to lift either.