Sound Advice!!!

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I have recently moved into a new build property and would like to explore options at improving the sound insulation between the party wall which seperates the two master bedrooms.

The issue that we have is that we can hear quite a lot of noise, even though it is not very loud, the click of a light switch, the toilet systern filling up in an en-suite, and general low level conversation. I understand that the cavity is on our neighbours side of the wall.

I am keen to explore options of either improving the cavity sound proofing materials already in place, RD35 I believe and looking at additional materials that we can place over the existing plasterboard wall in the bedroom,

Appreicate that this is not much to go on so would be grateful if you could let me know what other information you require,