Guys we need a lot of thinks for these to work but we could do it.
Starting with tech
The actual tech tree is small and unusfull so we just need to do it bigger or more hard to get tech points, or if your a good modder just do a new tech tree maybe like civilizations tech trees
The farms and workshop are nice but limited so we should change them for new building and give it more levels 5 farms and 3 workshop aren't a lot so 20 farms and 40 Workshop(or even more) (or fabrics the name doesnt change anything) but we should balance it by changing modifiers from 5% to 1% or 2%, should be 3 levels of ports first fishing port second mercant port and thierd dock, the buildings levels you could build should be determined by your tech level.
Next units should be implemented
Cavalery after will become tanks
Ships( you should build it in port level 3)
Each with different modifiers
Resourses like iron wood food fish iron and more
Implement a comercial and macroeconomics sistem here nations buys and sells resourses that needs and buys
Religions and cultures