Replace step motor that require higher voltage may help. Also the step motor smoother are very hot on facebook group now, many claim it can make step motor quieter.
I have not personally tried them yet, but get many positive feed back on facebook group. I would only use them on the axis that make most noises. Some claim get better print quality on e-axis. I recommend you do your own research on google before place order.
https://www.amazon.com/BALITENSEN-TL-Sm … s=smoother
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