How do I increase the font size in all Uxterm windows I open in Ubuntu 18.04 with LXDE?

I tried this:
xterm -fn -misc-fixed-*-*-*-*-40-*-*-*-*-*-*-*

Even though that increases the font size, it only happens on the new window that gets open. Moreover, the font does not look pretty after doing that.

I would like the font to be big enough to make it readable on any Uxterm window I might open any time.

Thanks