So I do think back in 2009 or way before 2009 something like apple fell on his head like Newton happened which made him think of an online Currency years ahead of it's time .
How a very simple thing could have helped discovered the Bitcoins , what are your thoughts ? Your take on what was the inspiration behind bitcoins??
An apple falling on Newton's head is probably a good allegory, to illustrate how unexpected the invention was.
Also in these 11 years there has not really been any digital currency invention that beat Bitcoin. No new fundamentals have been discovered or established that would be so big as to replace Bitcoin.
For instance, there has been research in algorithms for private transactions. This research has been helpful but the added value of the privacy that any of those projects added over Bitcoin, has not been felt as decisive by users enough to change, also given that that research itself is undergoing constant changes, which algorithm is the most private has changed about once per year or so, recent years. This is unlike Bitcoin which has been stable these 11 years, even while with some drama that culminated 2017.
There may have been a lot of systematic research behind Bitcoin's invention. However, Bitcoin as an invention is unique, it could not be anticipated, so you cannot say that Satoshi must have invented Bitcoin because of a particular personal reason such as that he was happy or sad or upset. Satoshi may have been that, however that was not what caused the invention, just like the invention of the refrigerator did not happen because of someone's mood.