Investing is when your money gains additional value, and therefore once you start your investment over time, it is supposed to increase in value over time. It does not matter if your investment is in bitcoin, real estate, stocks, or others, as long as your money will grow.
Bitcoin is considered valuable because supply is limited and the assumption that demand will increase, and therefore there is no guarantee that its price will increase.
If you do not have a strategy and a goal for your investment in Bitcoin, that investment may turn into a loss, either a real or accounting loss.
In short, where to find value, invest.
Bitcoin isn't the only digital asset that is scarce, but it is one of the very few that has organically grown an ecosystem backing its value. There are so many shitcoin copycats out there and all of them are scarce, but they are not truly scarce as they can be infinitely 1:1 copied and relaunched. Bitcoin can be copied, but everything that Bitcoin has grown around it over almost 1.5 decades now can't be copied. A merchant accepting Bitcoin is not going accept Bitcoin_2 even if it has all the same properties, because there is no market for Bitcoin_2. The supply is there, but the organically grown demand can't be forked.
The ecosystem and in particular the user and developer base are the economic moat for Bitcoin nobody can ever copy paste. That is why it is always funny when someone says they have developed the next Bitcoin or the Bitcoin killer. It's ridiculous because they don't get their funny Bitcoin killer off the ground ever.
Today Bitcoin's advantage is so huge that at least when it comes to digital gold, Bitcoin will probably never be replaced by a digital currency or certainly not for a very long time. Perhaps one day by a new technology, that is more likely. But it's not going to happen by any sort of fork.
It is the organically grown ecosystem, the moat that makes Bitcoin such an interesting investment. The scarcity speaks for itself and it is the most versatile value transmitter and storage system out there. Though we will need more user-friendly software in the future to also get those on board who long thought a tablet is too complex for them to understand and use, until they tried it for the first time. Today I would still say that it's too complicated if you want to use it safely and are also caring about privacy. That does need quite some technical literacy to handle Bitcoin accordingly.