The answers to this, for everyone, are simple: be the change you want to see. And keep it simple. Want advice on a run? Ask for it. Don't want advice? Let the party know you're new but want to try it for yourself. Don't be afraid to communicate. And leave your cynicism at the door. Was your last party toxic? I'm sorry. If the next instance doesn’t have the same party as before, don't act or treat them as if it were. Don't attack someone giving advice in old content, especially if no one else has bothered to speak up. Similarly, don't forget you were once new. We're all new every 3 months or so.

Be the kind of player you would want to party with, and you'll be amazed how easily you find exactly that.