1) get alliance of preferably 4 but make sure you have a final 3 deal with one alliance member
2) try not to have side alliances it gives people the reason to rat you out
3) be active on the public wall but don't be mean, rude, or a sore loser (gives you a bad reputation)
4) always communicate with your alliance and vote as a unit
5) be active but not too active gets people scared that you'll win POV so they think they can't win against you in F3
Do these things you'll most likely make F3 it's worked for me