It's about doing the right research and being patient. There are sufficiently underestimated currencies, but there are also many currencies that are highly overvalued.

I suspect that in 5 years AT LEAST 5 other cryptocurrencies will be within the top 10.
Some of them may not exist today yet.

Of course that doesn't mean that every project has potential. Most of the ICOs are still hot air.
And one of the disadvantages is that the market consists largely of traders and even projects with a huge budget are caught by greed.

Dedication within certain projects ensures that they can distinguish themselves in the long term.