Moral: I think BTC and ETHEREUM is better option for investment, Can be trusted blindly, profitable for long. Low Ranked Altcoins, Memecoins and shitcoins are just headache and reason of huge losses in long time. But anyone can invest his money wherever they want.
This has been proven through 2 cycles: 2017 and 2021. Many Altcoins have disappeared after just 1 cycle (4 years) or even after just a short time (meme coins or trend coins). Even coins that were in the top 10 many years ago such as Dash, Monero, Neo, EOS, Nem (XEM)... have almost disappeared recently, and few people mention them anymore. And of course, many Altcoins in the 2021 growth period cannot even return to their old peak. Therefore, besides Bitcoin, ETH is the only Altcoin that gives you peace of mind to invest in the long term, always growing steadily and breaking its old peak in the next cycle.
For me, I always have 2 investment portfolios: safe and risky. I only buy and hold Bitcoin and ETH as a safe portfolio. As for the risk portfolio, I will invest in new Altcoins that have new stories of this cycle (not reinvest in old Altcoins). And I only invest in this portfolio for the medium term (3-6 months). When this portfolio is profitable, I will take profits and transfer all profits to continue reinvesting in a safe portfolio.