How do I improve my channel, Im lost.

One of my videos got viral. I got a lot of views and not it's going downhill, which is to be expected really. But last few months I've straight up just been losing Subscribers and my channel is basically Dying. I don't really know if Im doing anything wrong.

Any Advice or Ideas ?

https://www.youtube.com/channel/UCYOUXbaMzfITAHFJY_kSTyg