I think you should stop using the word "invest", and state that it is speculation. Investing in crypto is the purchase of domain names and site building, or the starting of crypto projects. Just buying coins is speculation.
So if I follow your logic then I can say that people that are buying stocks in order to hold it for several years are bot investors but speculators. Which imho is not correct.
Under speculations, people usually understand gaining profit from price fluctuations on a smaller period while investing is gaining profits on longer terms. So hodling BTC can be called investing and if you are going to sell your BTC stock in a few days (or within a day) after purchase that will be speculations.
Totally agree, definition of investment put (money) into financial schemes, shares, property, or a commercial venture with the expectation of achieving a profit.
It doesn't say anything about time of your investment,
It wouldn't matter if it is just an hour or day compare to the long term holders both of them put up a money and invested in crypto so both of them are crypto investors.
And for the OP I think you are right we should invest now before it's too late.