You might consider some schools that are a bit easier to get admitted to, especially South Kent and Berkshire, traditionally soccer powerhouses. I would add the Salisbury School to the mix.
There are agents /people that work to place international soccer players at boarding schools. It’s worth reaching out to John Moodey at Northwood, as well as Matt Kokozka https://www.gespeducation.com/team. Depending on your goals, this program might be worth looking into: Woodstock Academy begins boys prep soccer program this fall