Game's really not that hard. Stick it on Settler difficulty and move it up one difficulty each time you win.
You need to step down in difficulty and spend your time in a couple games to learn all the new systems. If you think you can just jump right back in where you left off and still win without learning the new game rules then you deserve to lose.
Step down to prince and spend an entire game playing around with all the new stuff then step back up and try again. All the new systems are easily explained via the in game screens and don't need extensive documentation.
Basically, if you don't care about a culture victory, you still have to have a strong culture- that's the bottom line. But you don't have to put a single ounce of effort into Tourism if you don't want to.
That's not entirely true. Culture is what is used to prevent other players from winning with Tourism (and Tourism will not help you here), yes, but your own Tourism also helps against unhappiness due to different ideologies.
Well, sure, if you amass enough Tourism to flip other ideologies to your own, but in such a case wouldn't you be going for a Culture victory? It takes a significant amount of Tourism/culture to flip other civs in my experience. I'd rather devote those resources toward my primary victory condition or emergency response, usually.
No, no, that's not what I meant. Your Tourism also helps to reduce the amount of unhappiness you get when you are getting culturally influenced by a civilization with a different ideology. So it acts as a defensive tool, if only in a limited manner, too.
Therefore, even if you are not going for a cultural victory, it helps to have a bit of Tourism generated yourself not to go into a revolt (at least if the culturally dominant civs have different ideologies than you).
I won on prince now (using cultural victory) and I had 722 tourism (and leading with culture really hard (3 lvl 3 tennets and 3-4 policy trees or something)) vs Persia (he has only 2 cities for quiet a while and 1 is rather small...) but still he has only -16 from our Order ideologies.
On Immortal if the AI has even like 20-40 tourism they already put me in -30 (no trade routes, no open borders, no other stuff that I know of).
So... huh?
I don't understand anything and I still learned nothing. These numbers they mean nothing to me. If I have more than 10x the stats the AI have vs me on Immortal I still do half of the happiness damage? I still do not understand it. What I DO know is that it was hard to refrain from going total domination (which is a WHOLE lot faster & easier than a cultural victory). And the AI is cheating with a modifier of 1000% even on Prince? Can't be I miss something crucial...
I also don't understand what the point of "Dominant" is vs "Influential".
Another thing: if I have an army 2 era's newer and 5x bigger than his standing near his border, they still treat me like crap just because I'm a human player? They still refuse trades (or make unreasonable requests), they do not respond to tiny demands, denounce me for no reason, they still spy on me and get caught all the time, etc. But when I take over 1-2 cities they offer me a whole list of lux, cities, gold, etc.... So stupid...
P.S.
OMG I found El Dorado on turn 5... +500 gold! This is like a free settler... The 2nd ruin nearby increased my pop by 1 so on turn 7 I was ready to expand...
Aahhh... So it takes a lot of time because usually the AI on deity has a whole lot of culture and therefor are near impossible to beat with a PEACEFUL cultural victory. I can imagine that they have like 800-1200 culture/turn and I need to top that with tourism. So if they amassed 20k culture then I need 20k tourism to gain influential on them. But if their culture is insanely high then a peaceful cultural victory is impossible because tourism/culture largely depend on your empire size.
So on deity with 5 cities vs some runaway AI that have 20 cities is not possible to beat through a peaceful cultural victory? Unless of course you top them in science and get the hotels/towers/tourism wonders all up before they can amass any serious culture. But after that domination is a must then?