It's not at all hard to know what ladies want. Start by talking to ladies. The Internet improves your nerdy guy private life in a variety of ways. Distill them to crisp examples. Seek isomorphisms in your conversations with women. You buy hobby item X, they may buy hobby item Y. Or, maybe they buy X too, but are too put off by the culture of the sites/apps that help you with X. You have job N. They have job K. You rarely think about K because you're an N and a guy. And so on.

Teaching. Fabric and crafts. Child care (holy is there ever a billion dollars waiting for whoever cracks the code on babysitters). PR work. Marketing/communications. Office managers. Metalworking. Literary fiction. I'm sure you can find something.

I think one thing most women want is something emotionally gratifying. (I believe this is why rock stars get laid so much: Their songs meet some of those emotional needs in women that lots of men are so bad at meeting.) I think that is part of what typical "girly" loves like kids, pet cats, and "pretty" things have in common: They serve emotional needs rather than practical needs. If you can figure something out that serves an emotional need and a practical need for women, that's probably billionaire territory.

You know the saying: Men give love to get sex, women give sex to get love. If you can find a way to sell lurv, you will be in very tall cotton.

(Please note that I am female and not "talking trash" about women at all. Thank you.)