You’re entitled to your opinion. I bring the results of people studying the problem.
In 1990, President George H. W. Bush raised taxes, and GDP growth increased over the next five years. In 1993, President Bill Clinton raised the top marginal tax rate, and GDP growth increased over the next five years. In 2001 and 2003, President Bush cut taxes, and we faced a disappointing expansion followed by a Great Recession.
Does this story prove that raising taxes helps GDP? No. Does it prove that cutting taxes hurts GDP? No.
But it does suggest that there is a lot more to an economy than taxes, and that slashing taxes is not a guaranteed way to accelerate economic growth.