Which Altcoins have the most potential.

Meme tokens.

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Which Altcoin can make you a millionaire?

Tokens with quadrillion of total supply.

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A spectacular increase in the demand for altcoins in the year 2021 comes as no big a surprise.

Many of these "demands" are not real. Even coins or tokens inspired by Doge were hyped beyond moon unfortunately.

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As more people are inclined towards alternate sources of income, the cryptocurrency market has seen demand like never before.

They are just looking for get rich quick "investments".

P.S.
Not a financial advice Wink

I didn't mention any name so you would actually look for real projects on your own. Don't simply follow what people on the internet says.