Win/win renovations are the ones that bring value to the owner while living in their home & also add value if & when they decide to sell.
When I'm working with Buyers now I hear them talk about homes being "move in ready". Since CoVid, costs for building & renovations have skyrocketed, & in combination with long lead times or unavailability of everything from appliances to construction materials, Buyers would prefer to not deal with those problems.
When I say "move in ready", Buyers aren't being overly demanding either. They want functional & worry free, & feel they can make cosmetic changes over time if necessary. They'll even tackle more signicant alterations at a later date.
The key areas for Buyers are kitchens, bathrooms, & often storage. With other parts of the home, it's often mostly cosmetic, ie paint, wallpaper, or carpet which are easy fixes.
I posted some photos on my IG page @karinsmithrealtor if you're looking for some inspiration