You can apply for an extension of your B-2 status using Form I-539 before your current authorized stay expires. USCIS will consider your reason for extending, but approval isn’t guaranteed, and you must avoid working, even unpaid, in roles that benefit a business or organization.

If you're interested in future employment, it’s better to return to Zambia and apply for a work visa or training visa from there. Attempting to change status from B-2 to a work visa inside the U.S. is rarely approved and may raise issues of immigrant intent.

Participating in genuine volunteer work that’s unpaid and doesn’t replace a paid role is generally allowed under B-2 status. However, always check with an immigration attorney or the organization’s legal team to make sure the opportunity doesn’t violate visa terms.