Getting a large number of holdings (Domain Limit)

[Granite]

I've been able to get 12 holdings + 2 with the from the Stewardship focus tree for a domain limit of 14.
I know there is a +1 from the dynasty percs, but does anyone have any good tricks for getting more? And if I get more do the penalties outweigh the benefits, if say I had 30 holdings, let's day 20 above my domain limit?

[Average AMD neanderthal]

it outweighs the penalties as soon as you decide to go full north korea strategy. have a vast kingdom/empire where you own it all, and build stewardship and overseer for all the cash and control bonuses. and ofc any military traits and construction speed ups are welcome too.

this way you have no vassals to oppose your tyranny, and you can build a super economy with lots of MAA buildings to dominate over your neighbours despite the big penalty.

[BaCaz]

They nerfed north korea style so it's not a useful strategy anymore because they changed the maximum penalty from -90% to -100% so if you have 5 holdings over your maximum, EVERYTHING is disabled.

To answer your question OP.

You can increase your maximum holdings with innovations, dynasty perk and stewardship so the way to increase it late game (when you have all the ones from tech) is through stewardship, which will give you one domain per 5 points of stewardship. The easiest way to increase stewardship is by marrying a stweard and setting them to manage domain in your council. You can also get more stewardship by going into learning and getting the 'learning on the job' perk and there are some events like hiring a a tutor and such which can increase stewardship further. I usually have 17-18 holdings with 30-35 stewardship when i reach endgame.

[M82]

Doesn't that make you so strong that it gets boring ?