You want to raise GDP you need to invest in education.  You need to let people have healthcare that is not tied to employment so they can leave their current job to start a new business without jeopardizing the well-being of their family.   Raise wages at the bottom, this money will go directly back into the economy.   

As the commentator acknowledged interests rates are low, corporate profits are high and labor participation is high (although not historically).  Cutting taxes on the wealthy does not create anymore economic opportunities than already exists. It merely let's the wealthy keep more money that is invested in stocks or bonds and not in education and infrastructure which are the framework for economic growth.