Here is something to think about. Without deficits there would be no money left in the private sector to spend, to invest, or to save. Said another way, if the private sector wants some money, there must be a deficit. This comes from a simple equality even grade schoolers would understand. From recognition that there must be deficits that as the economy grows somewhat more money will be needed to prevent price deflation and real interest rates from rising. Therefore further deficits will be needed. In an economy that is growing the net deficit will have to grow over time. We will never "pay off" the "National Debt" because if we did we'd have no money, other than what we owed for taxes, in the private sector. In truth, of course, today the U.S. has no real debt. All of what we call the national debt is actually ersatz debt. Erstaz debt = something that has the appearance of debt and yet is not debt.
It's the level of this ersatz debt that we must try to opitimize according to the private sector's need for savings and investment, and the public sector's need for investment. Abe Lerner recognized this in the 1940s and put forth these ideas in his rules of "Functional Finance".