Your best bet for coins that could go to 10-20x, are low valued but high volume coins. Mint and Linda are currently 55 and 11 sats respectively, but they are in the top traded list in exchanges like cryptopia.
And you need to say the truth, it is pretty difficult to look for an altcoin that will make x10 or x15, the guy who created this thread is very, very optimistic.
The only way in that you can easily make that kind of profits is if you invest in one of those coins who are under the top 300 of coinmarketcap, with less than 20 millions of 30 millions of dollars on their total marketcap.
otherwise, you are just going to invest in overvalued coins who are not probably going to make that kind of returns.