I'm as big of a deficit hawk as the come, however I think the COVID relief checks should be look at the same way as we do disaster relief after a hurricane or earthquake. However I don't like the one-size-fits-all approach of giving everyone the same amount. They should proportion the check sizes based on IRS data of the persons 2019 taxable earnings.
Regarding the national debt itself, I think we are beyond the point that it will ever be repaid. The interest itself on that much debt under normal times would consume more than we could possible pay from tax revenues. IMO at some critical point in the future the currency will be called in and a "new" currency issues which is worth much less and will be used to pay down the deficit. I think big institutions are starting to realize that reality which is why there is a lot of demand for stored value assets like precious metals and especially Bitcoin and other CCs which will skyrocket under that scenario.