Hooray! I managed to find a page on a Chinese website with a brief description of the map walkthrough and several screenshots: https://dl.3dmgame.com/patch/110968.html Now I know where to get 10000 gold.
From that Chinese review, I also understood that maps with the abbreviation BT in their name are those where victory in battles is often achieved by repeatedly replaying them so that we get lucky and some random favorable factors appear: repeated attacks due to high morale, fear of our Azure Dragons by enemy troops, etc. I don't remember if anyone mentioned this before (if they did, it doesn't hurt to repeat it). You can take this into account when choosing Chinese maps for playthroughs. Personally, I don't like this (and "Brave People" is one of these maps, but I will still try to progress further).
Clarification: I just came across this quote, which explains the meaning of the abbreviation BT (I misinterpreted it, but the factor of luck still plays a big role):

Thank you for explaining the abbreviation BT in the map title because I see it on almost every Chinese map, but I never wondered what it meant. By the way, on GamerHome, the Chinese are very meticulous about the difficulty of the map. Usually, they immediately post two versions of the map: a simple ("popular" in translation) and a more difficult (BT) version. I once compared a couple of maps, and the difference lies in:
- starting forces of the computer,
- events where the computer receives different bonuses,
- guarding objects,
- timing of opening seers, etc.
The Chinese love to make players "randomize" in their maps. The most challenging battle in this regard was on the Jedi Counterattack map, in my opinion. In the battle with Lakus, who had legions of Phoenixes, Ice Golems, Azure Dragons, etc., Lakus constantly gave Prayer and Speed to his Phoenixes and had a ranged stack, so you couldn't just hide behind a force field. In short, in that battle, I needed to catch an unreal random event:
- fear of his phoenixes towards my azure dragons in the first round,
- in the first round, I needed to give Frenzy to my Archdevils and have them attack his azure dragons (and not get scared), preferably all under Luck,
- no one from our side should be afraid of his azure dragons,
- in subsequent rounds, it was necessary for the computer to randomly choose a specific order of spells (towards Resurrection, rather than boosting its own Phoenixes),
- I don't remember if he also had resistance.
The number of attempts per battle was 80-100, or maybe even more; it was a terrible battle.

P.S. I remembered another "wonderful" battle on the Xiedu map: you need to play about 25 rounds, something like that, so that we have an Archdevil and a Specter left behind the force field to consume mana. The computer cannot reach us and starts summoning elementals. So, you need to catch the moment when the computer summons water elementals (two-hex ones) because earth, air, and fire elementals are single-hex and can easily fly into our force field. I could never figure out what principle the computer uses to summon specific elementals, why in the same battle with the same setup, it summons different elementals (and water elementals seem to appear less often). In short, I needed to catch the random event of summoning specific two-hex elementals after playing 25 rounds.