The Lord is more alive than dead

I've been playing Heroes for about 7-8 years now. I don't consider myself a pro — I'm far from that, it's just a pleasant pastime. This map bent me over and then some... I tried to beat it 3 times, zero progress. I don't understand how to quickly capture the elf castles while not getting thrashed by the orange and green players. The first time I made it to the point where green appeared, never finding a way to the castles. The second time both orange appeared and a couple of weeks later green, they killed the shroud of night, the elf castle objective wasn't completed, green got reinforcements and that was that. On the third try I quickly captured the 2nd castle, found orange's fort, wiped out everyone, got on ships and reached orange's castle, but couldn't figure out how to approach it.. I went into the building nearby — the pyramid. I get killed there in 3 seconds))) Either I don't know how to play Necropolis or I'm a complete zero at this game😄. What's even more annoying is when people write here "yeah beat the map on easy"😵Alright, I'll come back to it later.. and I'll write that I finally beat it..