Using the phrase “left to pursue other interests” instead of “fired” is an example of -

Euphemism - a word or phrase used to avoid saying an unpleasant or offensive word.
বাংলা অর্থ - সুভাষণ
- "Senior citizen" is a euphemism for "old person".
- The phrase “left to pursue other interests” is a euphemism for “fired.”

Source: Cambridge Dictionary