You should keep track of some Altcoin coin that might have a boom in the near future like GO, MFT. Now they are quite good price should buy a little to hold.
Tracking any altcoin won't give him assurance that he'll earn x4 with his capital.
In crypto market, you don't have any exact return on how much it will be after buying a certain coin. If its for altcoin, I wouldn't go with those typical pump and dump coins. Though pumps do happen for some altcoins when there are news and shilling made by some popular personality.