While seeking for recommendations isn't all that wrong, it's only tough in the case of regrets and blames. Nobody is aware of the performance of most altcoins - things could change terribly in a market change or shift. Still, he could have more opportunities to choose and do his research on. He'd got some nice picks like Polygon, and Litecoin, they seem to have some potentials on the long term.
I'd also add that exchanges are better places to find out projects to look into, as they've got all the listed coins.
Usually, when a coin makes it on the exchange, it's already there regarding its.. Biggest time to gain profit from it.
If we are talking about the old coins - then surely, the best are already listed out there. Litecoin is a great choice, in my opinion.