I think crypto is still too young and is unlikely to end too soon.
Something that is censorship-resistant cannot "end" unless people stop using it completely.
Even though the first crypto was launched in 2009 namely Bitcoin, and the current price is very high, some other cryptos are still just getting started.
Take some free advice and accept that the "other" crypto that are out there namely altcoins are useless as an investment for the long term. If you are willing to throw away free cash to moneygrabbers and fund their yacht parties then by all means do so, but giving money to a beggar sounds better.
In all cases even if bitcoin price is high you can buy smaller fractions of it. You dont have to buy 1BTC all the time. That is insane at this price.
The current price fluctuations are only to shake the faith of new investors. Who can not survive the conditions when the dump occurs, it will experience a loss.
You will not experience loss unless you sell, you would still be owning that very amount of coins that you have bought, what decreased is the price in fiat for selling that many coins. Important thing here again is that if those coins are bitcoin, you can very well hold and you will see rise in future. But that cannot be said with emphasis when it comes to altcoins.