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First off, how do you even find out about these coins?
Second, what exchanges can you even find these coins? It seems almost all these altcoins are related to ETH. Does it involved pancakeswap/metamask and things like that? Is it easy to learn?
Third, these coins don't have any correlation to btc?
This is very difficult to spot. But if you are a risk-taker, you can spot this with shitcoins on a random chain like new altcoins that are published and scheduled to be listed on a huge exchanges, even how the market is dumped, this altcoin could possibly pump huge.
Second, I think what you mean here is Decentralized Exchange (DEX). If yes, I can say yes, these platforms could involved because most of altcoins now are starting on chains, like there are some Initial Dex Offering(IDO) you can participate to their token sale using DEXs and trade after the sale.