Had a quick scan of some sections in your guide. Perhaps you would like to incorporate the ff?
Hotkeys
I accidentally discovered a new hotkey last week: Typing S while in your city brings up the Relics tab. No need to go to the MH or World Map. Probably not that useful for advanced cities but I would have really appreciated this in earlier chapters when I kept checking how many relics I needed to get the next boost increase and didn't want to open my MH because there were coins in it while the World Map takes long to load. (Of course I pressed all the keys on my PC, including numbers and symbols, to see if there were any other hotkeys. Alas, there were none.)
Goods Production
TIP: When upgrading factories, you can check the appropriate Wiki factory section to see which level yields higher production. For example, I've found that it's better for my elven city to upgrade, say, all same-tier factories from Lv9 to Lv10 than to upgrade one to the max. Of course, time is an issue because I would like for the construction to finish close to the production completion of other factories so I try to time it so that 2 builders are working on upgrading two factories by 1-3 levels, stop when the others are about to finish a production run, then work on upgrading the lowest level factories. It yields more goods and is cheaper in construction and population cost (and I'm always running low on population). Right now, I'm in the process of upgrading 1 gems factory by 1 level while the other builder upgrades 2 residences in around the same time frame. Then, when the gems factory builder is done, both builders work on residences until I have enough pop to upgrade the lowest level gems factory by another level. I don't know if the same is true for human factories or other elven factories but I suspect it is since it has usually been the case for all my elven marble, silk, and gem factories as well as residences, workshops, and guest race buildings. The exception, of course, is when there is a size increase.
Btw, is there a list somewhere of all the production yields for all factory levels for all 4 production runs? I have a partial list from varron but I'd really appreciate a complete list as I've finally worked out most of the formulas for boost bonuses.
Trading Strategy
Understand your market's/area's/neighborhood's needs. I noticed early on that Marble producers are either Silk or Crystals and Elixirs or Gems producers so, if I want Crystals, I offer Silk or Scrolls to increase my chances of someone taking the trade. I noticed a marked improvement in takers once I implemented this strategy. My area is hungry for marble, crystals, and elixirs but has a surfeit of planks, silk, and gems so I offer crystals for scrolls because scrolls are what my FS needs. Those trades usually get snapped up quickly, even by cities that are not scroll producers. This will tie in with the 9 city combinations noted by Soggy:
https://us.forum.elvenar.com/index.php?threads/there-are-only-9-possible-cities.5007/