There are lots of threads about this on Asus z590 boards. Disabling some of the PCH ports (unused USB, Ethernet. etc), can help a little. And disabling Thunderbolt ports in BIOS reduces the temperature significantly.
There is a plastic shroud with the Asus RGB logo on top of the chipset heatsink. You can remove that. But I think that doesn't seem to help much. Maybe if you could also place a fan near it.
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