Most people generally think of Bitcoin as an "investment for profit". Again
Many Bitcoiners see it as a savings tool – especially those in developing countries. Because it holds value for the future and is personally controllable. The total supply of Bitcoin is 21 million and it has historically held its value for the long term. This makes it relatively easy to send remittances and Bitcoin can be seen as a "digital savings account".
There are price fluctuations in the financial markets.
But I think holding it for 5–10 years will actually be profitable.
By putting aside some regular portion, just like fixed deposits used to be. It is a type of investment or opportunity to make a profit. "Buy low, sell high" is an asset that you hold for the long term, not something that you "buy when the market is up and sell when it's low".
Let us not confuse investing for saving. Both are vastly different and depending on the context, investing could also be saving in some cases although most of the time it is not.
And since most people do not understand inflation, they think putting their money aside is somehow going to mean that it will retain its buying power. So in a way, they are still investing but into an asset that drops in value over time. Like a car.
Saving is just setting fiat aside and hoping you have a chance to spend it before the value drops because of inflation.
You could also save your money in gold or silver. But from an investment perspective, Bitcoin has higher volatility and therefore higher returns.