Whether one should invest in bitcoin or not depends on whether you think Bitcoin will become a long-term trusted store of value.
If it does become a long-term trusted store of value, BTC should trade around $2,000,000 a coin (depending on how many coins are lost and are actually in circulation). That is over 100x the price of where BTC is today.
If BTC does not become a long-term trusted store of value, its likely price will be close to zero (unless it becomes a "cool" collectible... which is a possibility).
So if you think BTC has a 10% chance of becoming a long-term trusted store of value, it is a good investment with a nice expected return. It is still very risky but professional investors should invest some small portion of their portfolio in this case.
I do not think like you, you can see that the crypto market is in the long-term bearish trend and although the bitcoin price is holding above $ 6000, the fines may drop sharply at any time. Therefore, to be able to trade successfully is very difficult, bitcoin prices are constantly adjusting and this makes the price of altcoin is very strong. I believe that the time when investors' confidence in bitcoin is losing.