My only advice is be funny and somewhat skilled at the games you play. In situations like destiny you can also try challenges if you have a good enough team etc. Now how to actually build up a rep for viewers I can't help you with, I'm assuming just word of mouth is probably how a lot of people get really big. Edit: I just read about make up and stuff, your viewers shouldn't completely rely on your looks(although I can't help but say it will probably help, because let's be honest here. Sex sells)