First thing you gotta do is interact with people. You seem to be doing that a bit already so that works.
Then, you have to look at people's posts and think "why would they be doing this as scum/town? Does this seem normal or fake? What kind of reaction was that? Good/Bad?"
Applying pressure is good to see how people react under it. However, telling people it's a pressure attack does nothing, so make sure you provide evidence of suspicion and see where it goes from there.
Finally, you lynch scum. Don't forget to have fun too.