As noble, night 1, you use private matters.
Day 2, Wisper EVERYBODY a message that looks like this:
“Hey, i am merc, you are my contract. I did not protect you night 1 to keep charges. Let’s win together =)”
As a general rule, BD players will happily tell you their role, or at least reply that theyre bd. Its quite easy to find their role. You usually at least find around 4-5 roles using this strategy.
Then, of course, listen to conversation of the king.
Using those 2 things, you can quickly know every roles. With some luck, maybe a cult or a neutral will even admit their role to you. And best thing is, if you get converted, you can really help out the cult.
I just used this strategy in a game, was converted night 2, and we literally did not lose a single cult member.
Note: if at some point they figure out what you did, you can easily prove you are noble by saying “well i used private matters and wisped all of you…”