Would it be possible to reframe your questions as follows? I am willing to help others without the expectation of being paid. How can I use what I know and who I am in the service of others?

As it stands I am not sure whether your primary goal is to do good or to travel? If it is to travel, I would say that you should travel to where you want go and once there look for how you can do good.

If it is first in your heart to do good then I will end with the words of a wise philosopher: "Never try to find a place to speak, try to have something to say." If you have something useful and good to say, the world will find you.