I have a YouTube channel but it was demonetized which is why I came over to DTube. But I still use it to transfer stuff from my Playstation 4.
I do use all of the other social media platforms, sometimes to market Steem, but I don't really get much traction with it.

As for subscriber numbers on YouTube, don't let the ebb and flow of people coming and going get to you. People will subscribe and unsubscribe all of the time and you will have no idea why. At least with DTube people get paid to leave comments and the eco-system is such that it's better for people support each other rather than tearing people down.