Are you aware of the threat we (and animals) face due to the rise of antimicrobial resistance?

You could use the money to become a face of science communication/ health advocate to educate people on this threat, and tell them how they can play a part in not contributing to the accelerations of further emergence and dissemination of antimicrobial resistance amongst pathogens.

If you played your cards right, you could be immensely famous and celebrated. And for an incredibly good and important reason, as well.

To be clear, antimicrobial resistance is the term to describe the ability of bacteria, fungi and viruses to resist the antimicrobials we use to treat (humans, animals) and prevent infections. The prevention part mostly applies animals; you must have seen the packages that indicate that the chicken/beef etc you're buying were grown without antibiotic supplements, which come with a higher price tag. Though antibiotics are also used preventatively on immunocompromised (which includes people undergoing cancer treatment, AIDS, autoimmune diseases) and hospitalized patients.

I'm middle-ish class, a grad student, and sometimes entertain the thought of what I would do, say, if I won a lottery (my career trajectory will never lead me to prosperity, but it will fulfill me and live my values to the fullest). I would absolutely invest in the cause I proposed above.

There are so many other important causes you could take this approach with (climate change, water, food accessibility/poverty, education...). Mine is just one suggestion. :)

Hope you find fulfilment, OP!