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There are also some super long fiber optic Thunderbolt 3 cables on the market, though like the HDMI-over-cat-6 solution, they are not cheap:

Optical Cables by Corning Thunderbolt 3 USB Type-C Male Optical Cable, 50m https://a.co/d/beERef6

Looking at that found this item, which seems to cheap to be good (under $100 for 8k DP over fibre): https://www.amazon.com/dp/B0B4S3F5CK/

I've been using this $32 15m one for a few weeks: https://www.amazon.com/dp/B098QC6XWS

It claims 8k60, but I've only used 4k60 though.