Servile or mysterious? That doesn't resonate with me at all. Could that be a function of your personality and not a widely applicable thing?
> seem 'interesting' without saying much is to elicit intrigue - or mystery, so you want to seem mysterious.
I'm sure there are people to whom that applies. But it doesn't seem likely to be widely applicable to me. Most people just aren't going for the "dark and mysterious" vibe.