Ask HN: What skillset does the world most need in your opinion

I've spent the last 8 years doing web dev but recently it's been feeling less exciting and I've been wanting to do something that feels more meaningful to me. At the same time my finances are getting shored up and I'm not rich but Ive at least insulated myself from basic hardships to the point where I can afford some risk. I'm thinking I would like to go to grad school but in the end school isn't the goal, it's gaining a unique skill set that would allow me to make the most meaningful contribution to the world around me I judge usefullness on two criteria 1) The ability of the skill set to solve a difficult problem that will minimize suffering or maximize quality of life for some group of people 2) A lack of people solving that problem already. For example while pediatricians are very useful to the world, I believe the marginal utility of one more pediatrician is not huge because there are already a lot of them meeting a majority of the need out there. One thing I'd be interested to hear about are specialized skill sets within earth science that have a lack of research manpower. But I would love to hear about anything very different that you feel passionately that the world needs.