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This factor can be considered as a "hard" factor that is very decisive for Bitcoin market cycle.
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No, it can be considered
a coincidence as it's only happened four times so far, and Bitcoin has been going up in general during this time.
So far, it has played significant role on Bitcoin market cycle, the cycle length, time of starting and ending of each cycle as well as very massive effects on Bitcoin price growths.
Says you. But there's no evidence halving has anything to do with investor demand for Bitcoin.
Ask any random investor of Bitcoin, and 99.9% of them would tell you that they don't know what "halving" is and they don't care.
And if you carefully explained it to an investor... they still wouldn't care. There's nothing tangible that halving does to the value of Bitcoin. Nothing. It's just a technical detail of the system that has no effect on anybody's holdings. And it's priced in to the product from the outset, so it's impossible this can affect the market.
The bull runs after halving were
coincidences and there's no reason to believe it will (or won't) happen again.