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You are right. Most of the investors who held the coins you mentioned made high profits. But I don't think altcoins are reliable for long term holding. In the future, we may regret not buying and holding these top alts at this time. I believe that good times are also waiting for investors who can buy ETH, SOL, BNB and hold them for the long term.
I am really confused by your 2 statements:
1. You have doubts about the future of altcoins.
2. You regret not being a part of it.
Essentially, everything traded in the crypto market has its own potential, but not all of them can provide you with long-term returns. There have been too many altcoin failures in the past and the list will likely continue to grow in the future. If you believe in the potential of some altcoins, then try to invest in them in amounts you can afford to lose, but you may have to admit that bitcoin tends to perform better in the long term.
Honestly I see very few investors who have made profits from altcoins. Most of the investors who have made profits are from Bitcoin holders. Many investors consciously want to avoid gambling in alternative ways.
We never know how many investors have managed to get returns from altcoins, but I'm sure the number is also large. Everyone will surely exploit the market and will find good potential in anything possible, so if it is about making profits, then you probably don't need to ignore altcoins completely. If your investment goal is to hedge in the long term, then it is best to avoid altcoins, bitcoin is certainly more suitable for that purpose.