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Thank you for your feedback.
I want to say that playing as Elves on this map is the easiest, and increasing the number of monsters won't make the gameplay more challenging, either for them or for the other Factions.
The map is primarily designed for Multiplayer, where the main battles should take place between players. The monsters on the map serve as a deterrent and as fodder for leveling up heroes.
If you increase their numbers, you can certainly create intense and interesting battles directly with the monsters themselves, but this will significantly slow down the game in Multiplayer.
The only thing that worries me in terms of balance for the Elves is that they have a very advantageous position. Neither the Orcs nor Inferno benefit from attacking the Elves until they have dealt with each other. Although they certainly have that option, and they can attack from two directions at once. This can greatly diversify the game and add an element of surprise. It all depends on how experienced the player is when playing as a particular Faction.
So, what worries me is that while the Orcs and Inferno are theoretically fighting each other, no one will bother the Elves, and they can easily gain both a quantitative and tactical advantage by simply striking at one of the weakened players at the right time.
Of course, I anticipated this, so the Elves' cities are located further away than the others, and the monsters on their territory are stronger. That is, it should take the Elves more time to level up than the others. But whether these measures are sufficient, or whether the Elves still need some adjustments, I don't know.
If people report that in a network game, the Elves ultimately gain a significant advantage, I will definitely revisit this issue and then they will indeed face more obstacles, as you requested.