Don't go all in with altcoins, always buy some btc. With that said, there are some altcoins that I truly believe are going to skyrocket in the next few months, and will most likely survive the next altcoin exodus. XMR, I can't recommend this altcoin enough, undervalued and huge potential to be one of the leading altcoins in the market. ETH, obviously. LTC, this alt has survived throughout the years and still remains solid in the top 10 alts.