First question to get answered is whether that's a typical temperature for X570 chipsets since it may be they're designed for operating at that temp level. CPU's and GPU's also are designed to operate at much higher temps than previously. And lastly: this must be the reason they come with fans.
Replacing thermal interface material is almost always a vain effort as even if it does something it gains at most a couple degrees improvement. The sole exception is when it's missing entirely or the cooler was poorly mounted in the first place. And that's true in everything: CPU, GPU, VRM, chipsets included.
The only viable solution is to avoid X570 altogether with a move to a B550 motherboard, assuming you have no need of the vast array of...