Sindome is a game of Cooperative Competition. In 95% of cases players are the good guys and other players are the bad guys. Players are the Johnsons paying and the runners being hired. It's not like other games where players are all on the same side against NPC evil. PCs are the evil for other PCs.
For cooperative competition to work you need to OOCly choose to engage other PCs as their villain, their hero, their mark or their hunter. You have to choose to engage as the looser and as the winner. If you refuse to engage the other PCs in a variety or roles, your story will never be as full as it could have been.
All too often PCs are willing to engage when it would make the the winner or hunter. But for some reason players almost never choose to engage as the loser or the guy getting put in a hard place. As soon as they are in a hard place they stop engaging and move on to 'just kill me' or 'do what you want, I'm just going to not respond in any engaging way'.
I get it a little. Most of us have a vision of our character being loyal to those who matter to them. Of being willing to die or suffer before looking weak or letting someone else have power over them. I am a hardass and that can never be compromised.
But I honestly think that you should really, seriously consider engaging more - even in ways that don't seem to favor your character or means they have to swallow their pride or do something they will immediately regret.
Give up info on your chums when the pressure gets high. Act fearful when you are isolated and without support. Let the other character blackmail you or be the 'winner'. Cower to the one baka then take it out on others.
The most colorful and fun characters in stories are, in my opinion, the flawed ones. The ones who have people who have dirt on them. Who have made mistakes they seek to rectify. Who have lost. Who have taken shit from one guy because there was really no better option then turn around and do the same thing to someone else.
If players do not engage each other, take the plot hooks they feed each other and are not willing to ever let their character be put in a bad position or compromise their morality or self image... Then Sindome becomes a far less engaging game for everyone.
I am not saying you should go and hand this to someone (though this can also be a great move in some circumstances) but I do urge you to be willing to play an anti-hero. A flawed character. To have IC losses and wins and to see both as OOC wins.