Hire allies. More money in allies = more gold made per attack. Also, build more guilds than forges/subs. They make more plunder. Be active and youll be surprised this adds up to a lot gl!
It all depends what sort of a clan you are in. if they have OSF s that open frequently i would recommend a build where all but one of your lands are guilds and one beastiary.
Get in a clan with an active osf that may have plunde wars get money and buy allies first not land I have 111k attack but make 5 mil a hit on osfs and have over 1 bil in allies really helps an I'm getting 100 mil per open and have been getting lands like crazy