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
As SuppahTime mentioned too, Kingdom populations fluctuate and bigger guilds do change kingdoms quite frequently. Before migrating yourself or your guild to a new kingdom for a few weeks I would scout out the kingdom, understand the dynamics (like who rules the kingdom, who is the top dog player, who are fighting each other), and based off of your information you gathered determine if it is a good kingdom for you. Finding the best kingdom is hard, but if you scout out the kingdom before your migrate you can make better decisions.
Currently I am in K126 with my main and my alt (farm f2p), it is run by a Chinese guild however the kingdom sees little to no action so it is a good place to farm.
I moved my main (165m might) and it was only 1 scroll also.