If you are not in plains yet for the stone pillars, you can plant a tree, especially the pine from dark forest, because it's tall and only has its crown up at the very end. The crown might be integrated somehow in your tower, f.ex. a garden area? Everything that touches the log of the tree acts like it is grounded (blue color).
Another way is to raise the ground in the middle of your tower and hide it in stone to get a raised basement.
Then of course you have corewood poles and later ironwood poles.
Remember, stone parts are foundations for wood. So if you start with stone you can go on with wood even higher.

Combinations off all those techniques can result in really high structures.

There are some good videos on YouTube about it, check it out!

Have fun!