Advice on closing long term positions under the $48,350 tax threshold to pay off 6.5% mortgage loan?

Just like everybody else I do not like the volatility of the market right now, and I don't like what I see coming. I have long term investments in total market, S&P500, and NASDAQ etf's. With the dip over the last couple days I can sell my long term S&P and NASDAQ positions and be just under the long term capital gains threshold. I also just bought a house and am wondering if it would be a reasonable choice to take those profits (should be tax free) and pay off a good chunk of my high (to me) interest mortgage loan. Any advice is appreciated.