Dry line your internal walls. We have done this to three of our bedrooms. We got a builder in to line the walls with insulation backed plasterboard. made no end of difference. It was just fixed to the existing wall surface and skimmed over.
It is a job that can be done room by room over several years so that the cost is spread.
You can get foil backed plastic underlay for laminate floors. I see no reason why that should not be put on a floor and carpet underlay and carpet but back on top of it instead of laamonate.
Make sure that any radiators on outside walls have aluminium foil behind them to reflect heat back into the room. You can get rolls of foam backed foil in any DIY store and it is not expensive, and it is easier to handle than kitchen foil. Cut it with scissors and stick it on with double sided sellotape.
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