You can buy bitcoin at this time only if you are good in trading. If you have límites funds Then you have to set target before investing And when you reach that target immediate withdraw that fund.but if you want to invest for Long term Then Wait for some dip And Then Cash onon that situation
Depend on his strategy, when he chooses for long term investment then this is not a bad time to buy bitcoin because there are many speculation that bitcoin will reach a high price. But for the short term investment it's indeed someone must know first about the strategy of trading because if he knows then it will be easy to get profit from it.