I'm a native English speaker/~B1 French speaker trying to very intentionally create a bilingual household environment. It's not pure immersion, but I can (and do) narrate what I'm doing for most daily activities in French, read aloud in French, consume French audio, etc. All much to the bemusement of my own French mentor, who's validated that I'm not instilling a terrible accent, but is also getting peppered with questions in my search for French children's literature.