How can you be sustainable while traveling around the world might be a weird topic, hardly being able to travel at all because of the covid rules.
However, when you have the time to mesmerize about traveling, this will perhaps lift up your spirits a bit.
If so, you might as well take the opportunity to design a sustainable travel plan. This is good for you, for the environment, for biodiversity, for the climate, and for the people that live in the countries and places you wish to visit.