Now is the right time to buy bitcoin because the price is decreasing because the holders are dumping their bitcoin, they just give you a chance to get bitcoin in cheaper price, you must use this chance as good as possible to invest on bitcoin.
If someone is asking you this question as he is interested in buying bitcoin, firstly let him understand the basic concept of bitcoin and how it works for the betterment of society and our financial health. Then just show him the best way to make bitcoin and then earning from it. And that is trading. Tell him to learn about trading and bitcoin and their relationship. Best of luck.