The Angkor Tree Project offers English students, English teacher students, English teachers or any equivalent profile the opportunity to become a mentor to a Cambodian student in a well-organized manner.
The mentor commits to have two one-hour conversations with a Cambodian mentee every week, for a minimum period of 3 months.
You can do this home. It's absolutely covid-safe! All you need is an internet connection and a pc or tablet.
See https://languagebuddies.org for detailed information and registration forms