Walkthroughs for custom maps.

I have a question about the Paragon map... my enemy doesn't want to go for the suicide run, but persistently attacks my heroes. Can you explain why this is happening?
Also, another question. Is it worth killing the green guy this way, or is it better to level up, defeat him properly, and take the artifacts?

Here are some immediate questions for you:
1. At the start, the bonuses for all players are different - the pink player received an artifact. You shouldn't do this on custom RPG maps: it's better to give everyone a gold bonus, unless the author specifies otherwise (those who like freebies can give themselves a bonus - an artifact). Bonus artifacts can disrupt the game or make it more difficult (sometimes - easier, if it's your bonus). The same applies to enemy resources.
2. If you are so strictly following the Manuals, why didn't you take Fire Magic for Mograine on day 3? After all, you chose a difficulty of 160%, and it would have been very desirable to do so! The importance of Fire Magic is very great, especially if you are not an expert.
What I think about the situation.
Why doesn't the enemy run to the resources, but attacks? The AI's behavior is not always clear to us, the players. Perhaps you should have moved further away. Maybe WSW was just lucky that the enemy didn't attack.
Most likely, you should try to open this guardian later, with a stronger hero and a larger army, and in the meantime, do something else. There is no single, absolutely correct step-by-step solution - different approaches are possible. Only the key objects and events should be exactly as the author intended.
And if your level is as you wrote, it's better to leave this map for now: its time has not yet come. Relax and start something easier. "Paragon" is definitely not for all players. Those who have completed it are definitely above average. It may seem that there are many such people, but there are many more players in "Heroes 3" in total. Some have completed "Paragon" on "easy" difficulty, but even in this case, it is only easier in terms of resources and troops, and the battles are still difficult.
Finally, some joker made a "childish" version of the map with Mograine, who starts with 9999 Azure Dragons, all 4 spellbooks, and all 8 tents nearby without guards. Anyone can complete that. :D