One skill that has proven useful in many EA pursuits is mathematics. From technical research to earning-to-give, mathematics gives people the chance to do uniquely high-leverage EA activities.
For undergraduates, graduate students, or early-stage professionals, you could recommend the Machine Intelligence Research Institute, which focuses on the technical problems of AI goal alignment. For alternative options taking advantage of that skill set (e.g., quantitative finance or an Economics PhD), you can recommend that they use 80,000 Hours’ career decision tool and apply for individualized coaching if they find the tool helpful.