How do I explain to friends and family why I need to cut ties with a narcissist, especially if they don’t see the problem?

How can I improve my English since there's no one in my environment who can help with it or to practice with. Plus, most English language exchange apps are useless because the learners there aren't serious about learning or up for dating instead?
How can you truly appreciate someone's talents and qualities without turning them into an object of your affection?