A 2500sqft-ish house is staggeringly large to live in by yourself. On the other hand, it's distinctly not the Roivas mansion.
If I had a 2500 sqft house, I would make extreme use of it.
My bathroom squeezes a 5 foot bathtub against one wall, with the opposite housing a towel rack less than 3 feet away. In the back corner, there's a sink, and there's a toilet behind the bathtub. I'm going to convert to a corner vessel sink with a custom-cut counter top, which will give me a massive amount of counter space but open up the space rounding that corner--it will enlarge the openness and mobility through the bathroom. A Toto toilet with a $600 washlet (no toilet paper; heated toilet seat uses warm water and a forced warmed air blower to wash and dry your ass), double shower head, and 21-inch deep jet tub with inline heater (maintains temperature) will complete a $3000 upgrade. Another $1500 goes into tile floor/walls, double drywall (sound isolation), insulation, and lighting.
That tiny bathroom will be a decked-out luxury spa.
I'm repainting and insulating the house. I'll pop the cost up by about $500-$700 on a $1500 job adding sound isolation. That doesn't include the $1500 of windows--the total cost comes to about a 20% increase, as a DIY project with no labor costs. That's just one room, hardwood flooring and insulation, new drywall, new paint. 75% decrease in sound transfer into the room.
Kitchen got an upgrade. More open, easier to work in, more counter space, more appliance space, and provides a combination counter/table so as to free up the dining room entirely as living space.
You'd be surprised how much you can fit into small spaces. Turn things a bit, move this bit here, and suddenly it feels much more open and has more utility. A little sound isolation eliminates the cramped feeling.