I prefer low-mid marketcap altcoins that those in the first spots of CMC. There may be gems amongst 100-300 positions in CMC that will make millionaires in the next bull run. I don't new millionaires will be created among those investing in coins that currently have a high market cap. You could get x10, i don't think more than that. And that won't make you a millionaire unless you invest 100K