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not4sale
It's complicated to plan, so difficult to advise over the internet but basic solution is extra sheet of plasterboard, maybe 2 at 16mm. Complicated solutions involve decoupling as much as possible a second acoustic wall from the original wall with an air gap and dense material, care needs to be taken with the joint around the new wall and existing floor/ceiling/walls to ensure it doesn't have vibration transmitting into it.
Basic plasterboard is a soundproofing panel though, all acoustic solutions require weight of material/density to work, decoupling is secondary but important.