I have one vocabulary question, please guide me.
‘I must avert the consuming of all the western supplements in that I am allergic to them’
Gaw Kai Muh

I must avoid (consuming)(the consumption of) anywestern supplements, as in that I am allergic to them.
Why can't I use the words 'avert' and 'in that' in this sentence?
Students: Are you brave enough to let our tutors analyse your pronunciation?
'avert' has two meanings
1. turn away (usually your eyes or thoughts). For example 'he averted his eyes because he did not want to see how ill his friend looked'.
2. to prevent or ward off an undesirable occurrence. For example 'the road had subsided, so the police set up a barrier across the road to avert any accidents'.
In your sentence, 'avert' does not fit what you wish to say, so you need to use a different verb.
As regards 'in that' it is not easy to explain, but a native English speaker would use either 'as' or 'because' here.

Best wishes
Actually I needed to attend a meeting yesterday and the people who attended the meeting were in hospital.I feel I had successfully averted a tragedy.Is this paragraph fine?
Hi again
'avert' doesn't work in this sentence either. To avert something, you need to make a positive action to prevent something from happening.
For example: 'because of John's quick action in grabbing the fire extinguisher, this averted a potentially disastrous fire in the kitchen.
Best wishes
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Hi,‘I averted a tragedy by stopping the consumption of alcohol as a doctor told me that my liver was not seriously damaged nevertheless it was damaged’. Is this sentence fine?
again, this doesn't work in this context. 'avert' is usually used when someone is preventing a one-off foreseeable serious event, such as a car crash or a building falling down.
I would reword your sentence as follows:
"I prevented further damage to my liver by stopping drinking alcohol after my doctor told me that my liver already had some damage."

Do you have a bilingual dictionary (English to your language). It may be useful for you to look up the meanings of "avert", "avoid" and "prevent". I think that "avoid" and "prevent" are much more commonly used in English than "avert".

Best wishes with your studies