Any dead kingdom where i could grow as f2p ?
Kingdom populations constantly fluctuate and big guilds constantly move. A good baseline to look at is base and forts. If the ruling guild is under 20b, it's probably a fairly inactive kingdom, double check forts tho, sometimes a family guild will take base for a week.
K34 is where I started, and I look at it from time to time, and no one has ever really invaded it, and the ruling guild farms 24/7