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Indeed new altcoins are not the best variant for long-term investment, if we are looking for projects for the long term, we should focus on top altcoins. l think they have more potential than others. As you above mentioned BTC and ETH are really the best options. ETH price is still high, but l think it will not stay at 1.5k. ETH will start price increasing in the future. We can make good money from ETH investment. l think l don't need to talk about BTC because BTC is the best.
There are pros and cons sometimes in even choosing altcoins in the top.
It's all about missing the opportunity and possible potential, but from how the top coins just stood their ground almost for many years, I don't think there's still a reason to invest to lower ranking coins anyway.
Anyways, still ETH for me in the end.