For me, I'd have my and my family's medical bills paid, I'd buy equipment and other things for my PhD (specialized antenna, LCR meter, a well-paid internship, cadence virtuoso semiconductor pdk rf tsmc 65nm and 180nm maybe more since I already got the 90nm from my institution) also air quality monitor to conduct a city-wide personal study for personal reasons, and get a bigger counter and an emf to explore abandoned buildings and see if certain suspected areas are radioactive, get native species of mycorrhizae fungi fertilizer for nearby trees, get a good PC and probably adopt a street cat, the rest I'd invest in solar energy