How do I remain humble and modest?

I’m a Christian, earnestly seeking honest, sensible advice. I started off fat and unattractive, then recently, I lost heaps of weight and became beautiful. Which I hadn’t been for years. I feel down to earth so far and I think God gave me this experience to humble me, as I used to be vain and full of pride. How do I maintain my down to earth nature? Considering that I struggled with this in the past?

How do I remain humble and modest?
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