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You stick a pair of these
https://www.amazon.co.uk/Stageline-21-2840-Passive-Level-Attenuator/dp/B0057G44WM/ref=asc_df_B0057G44WM/?tag=googshopuk-21&linkCode=df0&hvadid=310977318630&hvpos=&hvnetw=g&hvrand=14236048554340016284&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=1006959&hvtargid=pla-564256263085&psc=1 *
Between your source, cd player, record player or whatever (obvs it doesn't work if the source is built in) and your amp.
They attenuate the signal by, usually, 20dB so you can turn the volume up higher, to be in that "sweet spot"
*Russ Andrews do some for about 5 x the price. Snake oil's expensive stuffDisclaimer. I've never actually tried these, though I think I have a pair kicking about somewhere so can't comment on whether they actually work as they're s'posed to
Have you considered some inline attenuators twixt source and amp? Then you could pump up the volume but still be listening at neighbour-friendly levels