You can do an immense amount of good by donating to the most effective charities. Charity Science provides a free service that makes the otherwise intimidating process of securing your legacy as easy as possible. Their services will help you create a basic document that will honor commitments to GiveWell’s top charities if the unexpected happens, and you’ll always have the option to update your will.
To ensure that your money helps the world after you’re gone, learn more and create an Effective Legacy. There are also alternatives to the default legacy option for people with more complex estates.