I have no debt, just refinanced my primary residence (~$500k mortgage, $3000/ month) for which I pay extra principal ($600) every month (to turn 30 years mortgage into 20), maxing out IRA and 401k, have a monthly automatic investment in mutual funds ($800/month) with ~20% growth/y so far, 6m+ in high yield saving account, and save ~$1,500 each month on high yield saving.
What’s my next move for investing?