Hi. I did something simple. I replaced the stock fan with new one from Aliexpress. There are "buzzing" fans and "silent" ones. It's hit or miss situation, so i tried 3 different models. Now I have much more quiet vega 56 blower style card. This model did work for me https://pl.aliexpress.com/item/32831903604.html?spm=a2g0s.9042311.0.0.40d05c0fEyQB3I. It's a little less tall than the original fan, but it seems to keep stock air flow parameters.
It's running Folding@Home 24/7 and the noise is much more acceptable.
EDIT: I cannot give You guys any guarantee of spectacular success. The trick did work for me and for my gaming and computing preferences. I did not perform any complex tests of this solution yet, just daily workloads. And of course if You break Your GPU during disassembly process - don't look at me