IMO, this time the cryptocurrency market still growing up, you should wait and buy Libra coins by Facebook. This crypto make this market recover ai recent time. If you want to invest in the long-term, buy BTC now and holding to the price $20,000.
Why wait for coins that have not been released, besides there are lots of good coins so far to hold for the long term, I don't think that needs to be clarified if you just want to play safe in your investment then just choose old coins, because even though the price is high but this still has good potential for good returns in the future.