Playing a bit of hearthstone myself (only one I still have time for a bit) but used to watch it quite a bit as well.
To make it on hearthstone (extremely saturated) you need to be very good and or have an amazing experience with the viewer. I noticed that the succesful ones are people like Day9, ThijsNL, Kibbler, Trump, Forsen, etc and they all have their personalities. Your video is very plain, it doesn't show you much as a person (no face cam?) and it's key to make it.
You seem to be focussed on advice style, but I'm not sure if you even have managed to get to legend yet (it shows the default card back?)? If you did, use your legend back to show for it? And don't tell people your rank is good, people after advice style videos willl see instantly if they like your reasoning. I like watching a video occasionally if I have the time but yours was not good enough if I compare it to the ones I used to watch (Day9, ThijsNL, Kibbler and Trolden). Watch them how they do it to improve your own videos. Yours could also flow a bit faster, no need to wait a lot.
One final thing to get noticed is to win tournaments that are streamed on twitch. Do you also play on twitch live? You can also send your best wins to Trolden and get exposure but it has to be cool to get people to look you up instead of their favorite players who post every day already.