While I consider x10 is still possible with smaller altcoins (look here for a recent example - 80 to 800 satoshis in the first 2 July weeks), most short-term volatility is related to Pump and Dump activity or with low liquidity. It's very risky to try to profit from that.

I would rather try to discover the long-term stars. Look at the lower ranks at Coinmarketcap, grab the websites and compare. If you find one with a different feature which is not a centralized scam, bet on it and try to collaborate with the community - your gains will probably be very significant, but you should have patience - and the more you use the coin, the more chances it has to succeed.