You should play more aggressively, you can quite happily leave him to level up on minions whilst you 3v2 take down all their towers + cap their portals, that rook either has to give up his spot to come help or watch their citadel come crashing down before anyone has even hit lvl10.
The biggest mistake I see people doing is pushing to the mid flags and trying to stay put and playing cap and counter cap until lvl20, work the towers from the beginning, if you're the right demigods you can take them down without any trouble even in the first couple levels. 3 demigods zerging one of their portals can have it in minutes of the start, add a cheeky lock to that and you just boned their team before the game even got going (I play with people on TS to coord that though, playing pug is a grind fest)
The biggest mistake I see people doing is pushing to the mid flags and trying to stay put and playing cap and counter cap until lvl20, work the towers from the beginning, if you're the right demigods you can take them down without any trouble even in the first couple levels. 3 demigods zerging one of their portals can have it in minutes of the start, add a cheeky lock to that and you just boned their team before the game even got going (I play with people on TS to coord that though, playing pug is a grind fest)