The logic for investment is buying low and selling high and currently Bitcoin has a new ATHs is it safe to encourage new investor to buy now seeing how high the price has gone? My fear for new investors is that the don't experience a dip after buying since no one is sure of how far the new highs will reach.
Buying anything whether it's crypto, stock, commodity or any other thing at its ATH is not recommended not only for newbies but also for experienced user. At ATH, the experienced users sell there coins while newbiea made mistakes of buying it. If you are new comer then not to invest right now, if you have some knowledge then invest only 20 to 30 percent of your capital.