Thank you for the special holiday gift, Akina-san! You are very adorable and talented! I'm always supporting you from overseas. Also, your English got even better!
Most Millennials and Gen Z in Japan can speak very good English, but they often don't get chance to practice with English speaking people frequently enough. It's most likely down to confidence that you'll rarely find Japanese folks who openly speak it. My recent trip to Tokyo taught me that if you show willingness to attempt Japanese, and the person can speak English, they will pick up that you're English, and speak it at you. ☺ Akina Chan has a lot of talent, and I'm very impressed by her covers from what I've seen in the last hour after randomly finding her channel.