You should buy bitcoin because it is:
Inflation proof
still in its infancy
has cheaper transaction fees
much more secure and reliable
subject to capital gain without a cap limit value to fiat currency
eliminates third parties between you and your money
Faster (Time is more valuable than money)
The world is moving towards bitcoin/decentralized finance because it sees untapped potential within it.
Given that Bitcoin is designed in a way that the value of Bitcoin can only appreciate in long term scenarios, $1,000 worth of Bitcoin today might be worth $1,000,000 the next year and this makes everybody who hasnt invested poorer than they already are at this stage, not to mention inflation hits over and over again.