I just ordered this adapter to see if I can get it working. It seemed to have the highest hz rating at 4K of any adapter I could find. I should be in on Thursday so I’ll reply with my results.

Because that is not the normal way to adapt HDMI/DP. HDMI/DP conversions are directional so:

HDMI to DP =/= DP to HDMI

HDMI to DP is an active conversion and usually pretty expensive (especially for HDMI 2.0).

https://www.amazon.com/gofanco-Prophecy-HDMI-DisplayPort-Converter/dp/B07BT4BG4C/

At that price I would look for a display that has HDMI 2.0 input and can do 144hz over HDMI.