Should I believe it and do what I didn't do 21 months ago?
The answer is no! think, 21 months ago a child with $500 could buy 1 btc, myself living in a poor country did not cost me anything to go to my bank and buy $500 in bitcoin, I did this many times and for months. but dude... today the reality is another, few people have the financial conditions to go to the bank and deposit $15000 just to buy bitcoin, that is to say that you should not expect that this current price will increase more than 700%.
I am surprised that someone who has been around for so long like you still misses the fact that you can still go to your bank and invest $500 in bitcoin. and nobody is forcing you to own 1 whole bitcoin. of course those who got in first will be rewarded bigger, but also they have been taking a much bigger risk than we are today.
also who is to say it won't go up 700%? that is only going up to $110,000!
once when price was $500 people were saying those who invested back when it was $200 or even those who invested when it was $20 are in profit and there is no way we, who are buying at $500 can get the same profit. now look where we are.
bitcoin is just starting to get adopted for real. this past months we saw the beginning of the mainstream adoption. a tiny portion of the whole thing.