I have discovered my sweet spot after several hundred hours of gameplay.
And that is at Expert Mode!
At this difficulty level, there is still plenty of monsters to kill, wildlands to explore and conquer.
Tech pace progress at reasonable pace to allow for interesting gameplay and armies.
I tried out Ridiculous mode several times and found it to be simply ridiculous indeed.
Wildlands is cleared out.
Monsters is wiped out.
AIs finish their tech tree and is training in those multipliers instantly.
And I found out how overpowered Tarth is with 60% accuraccy boost.
I could fight the AI armies off but with horrible causalities due to all cheats which is to be expected.
So I accepted that my level is in expert because its most satisfying progress in there but at same time I'm now sad because the game no longer offer any challenge to me nor any fun at all. 
Ok to try make long story short.
I shall load up a screenshot to help you understand.

I was only at war against yithril for this game.
Red Circle is where my Capital cities is at, a town, fortress + Conclave.
Black Circle is where Yithril's capital cities is at.
Me is Zanber, Yithril is Yithril. We fought each other to a stalemate early on. To put it simply, we killed each other off but yithril had a slight advantage to Juggernaughts running around with 40% accuracy bonus, i don't even know how he did that so early in the game on expert. But he didn't have the balls to assault my cities unless he had a garbage army to remove the militia first. And he didn't' have any suicide armies in place so he just gave up and took his ball home because if he can't cheat by removing my militia he won't risk his army like I do when i assault his cities. fuck him.
This left me pretty angry. So after his cowardly armies left and we signed a neutral peace. Yithril entered world conquest mode. While I entered expansion and consolidation mode. There was alot of unclaimed lands and a couple of wildlands to my south. I was right next to curgen's grave which I expanded into first. Then the yellow circle was Imperia Wildlands. Which I found out was kind in middle of map which prompted me to start an all out attack due to it's excellent central location. After taking it over and constructing three fortresses plus a conclave so heroes stationed there can purchase blizzard/wellspring scrolls as necessary without abandoning defenses.
White circle is where Yithril expanded to. Took bit of badlands and took lands from Altar, pariden, and wiping out the dead. He was on the roll to win the game but yithril forgot one important thing....
The fact that his capital cities is right next to my capital cities.... Needless to say, after yithril overextended themselves i mounted an fast war on the yithril and took every single capital cities they had and burnt them to the ground in case he had an impressively large armies returning to take the cities back but never materialized.
After burning down all of his core cities yithril just surrendered to me, few armies i fought from him did manage to show up but got wiped out..
Then I just quit at this point because I already won. All other ais is too weak even when I razed yithril's cities.
I want to do stuff like bring 20 armies to have a good fight with AI's 20 armies. But it simply cannot happen and it makes me sad.
But it can happen if I suffer through ridiculous and live long enough somehow which is something I"m not willing to do because I want to have fun and frankly, ridiculous isn't fun
And I'm not ready to see someone before I check insane setting 
Its so friggin hard to find a Good Fight!
And the thing that makes me angry is that I never get to try out Guardian Idols.
I want to play with it so badly but I have yet to play it cuz AIs is such wusses and weaklings that can't fight you unless you play on ridiculous and up. Unless they brought a garbage suicide army to remove ur militia first that is so that you never have to have that awesome epic siege battle because screw human players.
I think I have played with regular Guardians only three times.
And gotten the quest which unlock one of the guardian idols for you to play on field named bill once. x.x I wanna play with guardianssss!
despite this, I'm still playing FE:LH on expert hoping and hoping that I get lucky and find that super exclusive good fight.
Oops I rambled.