I highly recommend that you look into effective altruism before making a decision. It may give you insights that enable you to scale the amount of good you're able to do with this money by many orders of magnitude. I can recommend the book Doing Good Better as an introduction.
You have the resources to do a tremendous amount of good, and I hope you'll take some time researching on how to maximize it.
I just updated my brainstorming post, copypaste here (taken from <em>Doing Good Better</em>:
> Research shows that the most consistent predictor of job satisfaction is engaging work, which can be broken down into five factors (this is known in psychology as the ‘job characteristics theory’): > > 1. Independence — To what extent do you have control over how you go about your work? > 2. Sense of Completion — To what extent does the job involve completing a whole piece of work, so that your contribution to the end product is easily visible, rather than being merely a small part of a much larger product? > 3. Variety — To what extent does the job require you to perform a range of different activities, using different skills and talents? > 4. Feedback from the job — How easy is it to know whether you're performing well or badly? > 5. Contribution — To what extent does your work ‘make a difference’, as defined by positive contributions to the wellbeing of other people? > > As well as job satisfaction, each of these factors also correlates with motivation, productivity and commitment to your employer. Moreover, these factor are similar to those required to develop flow, the pleasurable state of being so immersed in an activity that you're completely free of distractions and lose track of time, which some psychologists have argued is the key to having genuinely satisfying experiences.