Dear Esther,
My answer to your queries:
a) Yes, I would agree that you are weak Earth turned dense. Thick earth is weak due to the season but dense due to much earth.
b) I would say your Useful God is Wood. Fire is necessary in the cold month of Winter for Wood to grow and survive. I do not agree with using Metal and Water in the cold season of Winter. This makes the earth too cold.
c). Yes if you do not know what you need to do to CHANGE your life. Did ask your Uncle to tell you WHY you would suffer such fate? Your BaZi also clearly indicate the cause of your problem. If you know the cause, then you will also know what you must do, to change the outcome. If you work on the solution, you will not be single until old age.
Destiny can be managed. You need to know how to ask the right questions. Asking for whether your Earth is strong or weak and what are favorable elements are NOT useful, actionable information to change your destiny. You should have used this opportunity in this Q+A and asked - WHAT action steps you can take to get what you want in life.
Warm Regards,
JY
