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Just get a USB-C/Thunderbolt HDMI adapter that supports 120Hz - like this one: https://www.amazon.com/Sabrent-Function-Resolution-Thunderbo...

The nice thing about having expansion ports is you aren't restricted to what Apple bundles with the machine.

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Unfortunately there is something preventing this from working, not entirely sure what.

A lot of people have tried, and nobody has gotten 4k@120hz working on an M1 over HDMI (or a cable converted to HDMI).

Now that you mention it, I have had a lot better luck with Display Port than I have with HDMI - will have to go to a friend that has a high refresh monitor and test out my display port hub.

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