Hey Peter, appreciate the offer!
What advice would you give to a talented teenager who is looking to get to the U.S. under a B1/B2 visa for a short period (under 3 months) to engage as a volunteer in activities for a non-profit in the US (the organisation covers living expenses for the duration of their stay) and has failed a few times to get a visa approved? what would you advise them to do? Is the visa type incorrect?
For context the activities would be in the likes of content creation, helping organise events and perhaps open source software development.