I've never understood sealcoating! My father and my father-in-law never did it, and we've never done it in our own house. Yes, it makes a nice black surface, but all my sealcoating neighbors have huge, visible cracks in their driveways and we just have one or two small ones. I've never seen any huge difference in terms of driveway maintenance. But I guess I'd ask my realtor how critical things are in your town these days.
I think a light scattering of mulch can improve curb appeal, as can a good spring clean-up. Things inside should be in good repair, and I'd say that new blinds can be fairly inexpensive if you need to repair broken ones, but I wouldn't order all new ones when you don't know the buyers' preferences. They may want to redo everything. I wouldn't buy valences or other things you can't take with you. Declutter to open up the rooms and make them look larger, and maybe put a quick coat of neutral paint on some walls, but if you're trying to make back your money, you won't.
I'd also talk to a good realtor and a good stager, saying "I have X dollars to spend, what's the best way to do that to maximize return in this town and this market?" My neighbors did that, told the realtor they had $10,000 tops, and they did what she recommended. The realtor is motivated because a quicker sell for the best price benefits her commission, and if the realtor also has a sense of style, that helps. But you have to decorate for the buyer, not for yourself, and that takes an objective eye.