There are many strategies about building houses on the Internet, and I didn't pay much attention to them. In my opinion, it depends largely on luck. Like me, every time I just follow the five elements, there are all kinds of houses, and those are uncertain. As for you, you can only blame your bad luck.
The second question:
Generally, no one wants water when they are dry, so don't think about making money at first, but think about how to recover the cost to the maximum extent. You can advertise all over the world or keep an eye on whether anyone in the world accepts the house. Well, the price can actually be sold above 150. Dry water is generally not bought, so it is better to change it into money if you leave it in your hand. You can get 150W when you demolish a mansion, so I suggest you sell it above 150 W. My dry water was directly demolished, and no one asked me for a long time, which is quite tragic.