Should I sell my cash-flowing house-hack?

[Alex Houser]

So I'm looking for opinions / advice / tips on a duplex I house-hacked back in 2018. Here are the numbers:

Purchased for $349,900, plus $25k in renovations.
Refinanced for $425k (currently owe $375k)
Currently rented for $4,700 per month ($1,500 per month cash flow after expenses).

I have a buyer willing to pay $600k in cash for the property, which would give her a 9.5% cap rate on her investment. In turn, this would allow me to pay off the mortgage, pay off about $70k in student loans, and still have $150k left to purchase another investment. On the other hand, this property makes me $18,000 per year in passive income.

Should I sell or hold??

Thank you!!

Alex