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.
It depends on what strategy you will use and your target.
Bitcoin reaches $68k this year and now it dumps to $55k, I guess it has already dipped hard enough giving us an opportunity to earn in short term. However, it does not guarantee anything as $55k might is already the lowest as it could dip further and that could result to panic transforming the market from bull market to bear market.