I think you need to pay attention to PRL or GLA. These altcoins are certainly not from the top 100 but they have a great prospect.
Indeed, if you look to make 5x or more in a reasonable timeframe do not even look at the too top 100, rather look at the other end of the spectrum and find some hidden gems with potential but low market cap. Oyster Pearl is one of them, or go for Oyster Pearl which costs a fraction and probably still more room to grow. I think Oyster will explode in 2 weeks when the main net is released. And if they can really deliver on Shells vision of free (unrestricted) internet I would not be surpised if it does 50x or even 100x until the mashnet goes live.