Everyone in fastings usually try to find an alliance before the game starts. If you're one of those people make sure you're alliance is at least majority vote with trustworthy people(you don't want someone to backstab you near the end). If you're in a big alliance such as 6+ people make sure you're in the majority towards the end.
If you end up in the majority you're pretty much golden for final 3. Just ride out the big alliance until you need to vote them out. Have a good day everyone. That's my tip on big alliances.