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This should probably be fact checked but as far as I've heard, between the two numbers, IQ vs Zip code, the zip code you were born in is a larger indicator of future success. So social environment definitely plays a large role as well.
As far as what contributes the most? I'd like to think I was just born being this awesome, but in reality I have no clue. (Also I'm not that awesome)
Caplan summarizes this research in Selfish Reasons to Have More Kids. I'll defer to that https://www.amazon.com/Selfish-Reasons-Have-More-Kids/dp/0465028616
...or Steven Pinker's The Blank Slate, for that matter.
IQ is definitely more important than zip code but the two are correlated
You were born awesome presumes your awesomeness is innate not cultivated by environment
Genes are more important than environment
don't disagree with you, but as a matter of scientific inquiry it remains muddled: your mother gave you genes and upbringing/social environment. Very unclear which one contributed the most to your future success