We have a horrible mess of reflections here in the living room. I think what would help me the most is visiting others' solutions and pick and choose what my wife will be ok with to fix our place.
Since it's a living room and you wouldn't want acoustic panels on the walls, hang a tapestry on the rear wall behind the listening position. Worked great for me. Plus, definitely drapes and rugs.
If windows are part of the problem Marigo Tuning dots really do work and are about the size of a 50 cent piece - one per small window, 2-4 on large windows
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