HDMI even 2.0 usually limits us to 60Hz so first we need to know what video ports this laptop has.

I'm reading https://us.msi.com/Laptop/GT73VR-TITAN-PRO-7th-Gen-GEFORCE%3Csup%3E%C2%AE%3Csup%3E-GTX-1070.html#hero-overview

There it is. Mini Display v1.2.

Remember I won't get into why 60 happens on HDMI and convertors. That's well done. You can google up why such as http://www.tomshardware.com/answers/id-2192493/display-port-mini-refresh-rate-issue.html and I'll focus on the Mdv1.2 connection and possible monitors.

That out of the way let's read https://www.howtogeek.com/267650/how-to-make-your-120hz-or-144hz-monitor-use-its-advertised-refresh-rate/ and notice that Asus. Not 1080p so searching.

Read https://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Order=BESTMATCH&Description=120hz+monitor&ignorear=0&N=-1&isNodeId=1 and pick one that meets your display port connection and price.