I think that it's a good time to buy Bitcoin because the BTC price is very low, however i have a feeling it can still go down more before uptrend again.
you do not have to worry though nobody knows the value of btc will go down again what not, buy now means you are on the safe line to do hold btc because in my opinion its value is very cheap
And if the value is cheap it means it is the best time to buy bitcoin because for sure after decrease bitcoin will increase again and we will get profit from that.
maybe he needs to wait until next week because today, the price increases again and I think it will be worth to wait for another day. but if he can accept that if he buy right now and in the next week, the price is down then buying bitcoin now is fine. but for me, I think we are in the weekend and everything can be happening as we know that almost every weekend, the price is up and in the next week, the price is down again. but it depends on what will happen in the market and if there are many people still buy bitcoin then it means the price can increase higher.