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You're absolutely right! Bitcoin's decentralized nature is one of its biggest advantages. Being that it operates independently of any government or central authority, the value is determined solely by market demand and supply.
unlike money or fiat issued by the government bitcoin has limited supply stopping at 21 million and this allows the price to continuously rise because it’s not bound by inflation in fact even goes against it
So, holding Bitcoin for the long term is indeed a smart strategy, especially during bullish markets when prices tend to rise. Lots of investors have seen substantial returns by patiently holding on to their assets
you should be owning bitcoins already long before the bullish cycle to really maximize the profit you can get