Just watched your last video, it's definitely interesting and kinda made me open my eyes on the culture shock you must be experiencing in Japan, as well as that, the locals must be experiencing having an English woman, or even a woman of European descent, fluently speaking Japanese. However, I will say the quality of the camera is a tad bit distracting, but your viewers don't seem to mind. You seem to have a somewhat consistent amount of views, with your most popular being the japan vs korea.
My advice is to feed off of that video, do more comparisons between Japan and Korea, and neighboring countries. Additionally, you're in one of the best positions ever to be on youtube, since you live in Japan and are bilingual you can really showcase Japan for what it is, and what so many foreigners are obsessed with. I would recommend shifting your focus on your channel to emerging yourself in Japanese culture on camera. Trying new foods, japanese snacks, j-pop/k-pop reactions, all those things. Find the weird things in Japan that would make us overseas go "wtf". Also continue doing more culture shock videos in addition to that. Overall, I'd suggest centralizing on showcasing Japanese Culture and sharing your experiences (which is essentially what you're already doing).
Keep it up, you seem to be on roll! Btw, are your subs matching up with your views?