Are you trying to save human lives? Reduce suffering? Reduce some specific harm, such as from pandemics, or from severe weather due to climate change, or from trampling by elephant? Cure the specific disease that killed your great-aunt? Stomp Nazis?
If you say what you think is worth doing, people can point you to specific groups that are doing it.
What are you trying to accomplish?
Are you trying to save human lives? Reduce suffering? Reduce some specific harm, such as from pandemics, or from severe weather due to climate change, or from trampling by elephant? Cure the specific disease that killed your great-aunt? Stomp Nazis?
If you say what you think is worth doing, people can point you to specific groups that are doing it.