I don't mean to rain on your parade but I just want to paint a realistic picture - you can make money and lose money in RE.

I think the best you can do is add a few accent walls in the bedrooms and make it less neutral. we paint everything white in our new builds and very neutral as well as do higher end simple painted accent walls and trim walls to help make the house a little different. if you really want to sell I'd get a interior designer / stager and spend 5k with a way more experience agent who sells new builds. we are licensed if you can't find someone. the way I market is very different. 

Also, It is an older home so lead-based paint may come into play during a potential demo vrs a kilz paint over. 

Little background on me to help paint the picture for my business concept.

There's no point in idly waiting - we have travel bins ready to go with things like window screening, exterior trim paint, gate latch parts - they're always broken, deck screws, toilet replacement parts, outlet covers, etc. 

It's amazing what new flooring, cabinets, and paint will do to a home.

Remodeled kitchen, painted cabinets, new granite countertops, new stainless steel appliances.

If the sample(s) that tested over the threshold were from under a window (which is the norm), you probably need to address the window frame/sill and I'd recommend just cutting to the chase and painting them. 

In addition, minimal cosmetic upgrades, painting, new décor and new flooring will add more value relative to its cost.

Lots of tree pruning, pressure washing, and painting today.