Game is more fun, when cities, like on classic map, or regions, like on Europe map, are closer to each other with power/strenght.
The easiest to make those distances smaller, is to put limits of players lower.
I don't know what are they now, but I guess it would be better, when they are lower. I mean that You cannot join so easily most grown cities/region, grown in number of players.
Firstly other cities and regions would have to fill up more in players, before more of them can join top cities and regions. And counting it in active players (logged in and transported something during last 3 days).
Its not much fun, when You have so big difference, that You just dont have any chances to win as region or win the End Game. Many players just quit then the rivalization.
Making it more equal, more equal chances is better and more fair. Like in sport, teams are with same number of players.
Lets put more of equality in RN competition! To make it more emotional, more fun! And longer fun.