Yeah I replayed from the left side and it’s definitely harder from there because of the proximity of yellow and brown but still doable. The biggest bonus to playing from the left is that the pharaohs arrive later and you can boom with fishing ships.
First thing I did was rush my extra unit with two chariots while killing orange base and taking vills with the rest of the troops. Send villagers directly to the shoreline, make TC next to brown granary and a dock. First thing out of the dock is a scout ship because brown has one that will come to kill your stuff. They don’t seem to build anymore navy after that(perhaps bugged) so just spam fishing boats. I built 6 ships anyway because they can kill everything from brown on the shoreline(albeit they take ages to kill buildings.) Then I just used the early troops to defend myself while I bronzed and then just spammed chariot archers for the rest of the game with a few catapults for taking down towers.
Now, there’s two problems you’ll face going west, first is that brown base is right next to you, I dealt with that with the ships and building my barracks in tower range, so the tower gets stuck shooting the barracks, not your villagers when you cut down the forest next to the base before that base is destroyed. The yellow base continues from where the brown base left off, so you just keep going south with your army and taking ground bit by bit. It’s like the western front down there, really annoying. At some point both brown(catapults, camels, chariot achers) and yellow(slingers, catapults, swordsmen) will end up attacking you with their armies at the same time(60+pop army OUCH!) and you’re going to have trouble then. Kite with your chariot archers against the swordsmen and make sure you dodge catapult shots. You’re also going to need a decent amount of production to keep replacing your army in a timely manner. I had six ranges, but that was too little, I recommend ten. Hold with great honour and rebuild your army(and possibly economy.) Then after brown shorebases are dead to your ships, delete all navy aside from two ships, these will be left as coast guard to kill stragglers. After brown has been mostly eliminated(they have some more base inland but all their eco is on the coast) you can easily overwhelm yellow(watch out he likes catapults.)
The other problem is that at some point red is going to have built his eco up and will start attacking you from the top side, in the worst case scenario this times perfectly with a double attack coming from south and uh-oh, not fun. You should definitely try and tower/wall up the top as you keep expanding there. Red mostly comes with swordsmen and priests, but I’ve seen a few stone throwers as well. I didn’t tower up myself so I had to juggle my army back and forth and sometimes pull all my villagers from the top until I had dealt with the attack down south and could spare sending units to the top again. Definitely tower up, it will help you so much, even if just to buy time. Remember to make walls around your towers, this will protect them against the swordsmen. After brown and yellow are dead, you are free to do whatever, red alone isn’t a threat.
As for unit composition, chariot archers are excellent because they are population effective, microable and the upgrades synergize with towers and ships. Some Scythe chariots are a really good addition a little later on if you can spare the resources for their upgrades because they will block the Legions from closing the distance to your chariot archers but don’t do chariots from the start because there is very little space to fight in most places and chariots are big units that need open fields to fight effectively. You’ll need catapults for breaking the bases fast enough as well. All three AI players build priests so don’t make elephants and you don’t have all that much gold so academy/horse units are not that great either.
Remember to send a transport to the island and build extra docks closer to keep your fishing trips from becoming too long. After the island was empty from trees and gold, I used it as my farming area because it’s completely safe, turned out to be a pretty good idea, I never needed more farmers than I could fit on the island. Also get to Iron pretty fast, you’ll need that alchemy and ballistics for your archers.
This should get you through the mission on the left side. If it seems too hard, turn down the game speed and perhaps lower the difficulty as well. This was played on Hardest difficulty and in the current 5172 patch.
I ended up killing everything from the map but it is faster and easier, to just rush from the east side to the artifact with only red in the way. This method was more fun though^^