honestly, be yourself.
just, say what's on your mind. if a villain in a game is ******* you off, don't be afraid to rage a little bit.
for example, popular gamer DashieGames gets upset at games he plays cause he stinks at them.
or, you can also just learn how to make conversation. say things like, "I hope you all are doing well today." Talking about your day can be great to do as well, so your viewers can learn about you. Saying silly jokes or pop cultural related things as well (i.e. - damnnn daniel) things like that are pretty funny to people.
but most of all, you shouldn't push it cause then it'll seem forced and people may notice that kind of thing.