Here are a few realistic 3x-4x coins
Tezos
Metaverse ETP
Komodo
My recommendations are as follows:
1. POLY - targeting security token industry, currently only they're doing it.
2. PRIV - No ICO done, 20 Airdrops to community members, already 9 Airdrops done. Already listed on CMC
3. NEO - Termed as next ETH of dApps, currently at real low price.