The most challenging maps for you.

About 10 years ago, on the Heroes of Might and Magic III 3.5 disc, there was a map called Gold Heart in the list of standard maps. Back then, I didn't have enough knowledge or experience, and only now have I decided to try and complete it (I was looking for the best maps for RoE). First, for the first few weeks, we search for Castles, read the storyline a couple of times per turn, and generally waste time. Although Logistics and Pathfinding are standard skills given to our hero, Apro Mort, it takes a while to level him up to an advanced level, let alone an expert level. No matter how many times I try to replay. Plus, there's sand at the beginning, boats, etc., resulting in very short turns. Second, our first enemy has 5 Castles, which are located close to each other, within a distance of 1-2 turns. There are also many dwellings nearby, which means his growth is significant compared to ours. We only get our first Castle in the second month, and it takes almost another month to gather resources and build at least champions. When we finally unlock the Border Guards, the hero with the growth from 5 Castles + external dwellings (while we were just running around without Logistics and Pathfinding) gives us a hard time. At most, I managed to capture 4 of his Castles, and while his main hero was reclaiming his Castles, I was holding back his growth and buying resources with the last of my gold, even though all the resources were already depleted. Unfortunately, the main hero abandoned his Castles and went to my territory. I had to chase after him with everything I had. Here is the save file before the battle. Is it possible to win here? And what is the best way to complete this map?