Any time is good but buying during peaks still is not a wise thing to do. Why should someone buy Bitcoin at 100K when there will definitely be a much better possibility? Anyways, it's not a bad idea but it's not the best idea too. At the moment it costs 86K and I think it's a very good time to buy it. We already tested its potential, which is 109K. Bull cycle has just started, so I'm sure we are guaranteed to see it going up to 100K and even further, probably up to 150K or 190K.
Are you tying to say the price of bitcoin is not going to exceed $100 again? And people should not bother to buy again. If you think people shouldn’t buy now and wait for sometime to buy what is the essence of waiting and buying?. If you say people who are buying to make quick profit shouldn’t buy it is understandable. For those who are going for longterm they can buy at all time , no need to wait because the value of bitcoin and won't be the same in the future.