-snip- it sounds like when people are calling for 100,000$ per BTC months ago and the opposite happened, now people are calling for 10k again, the opposite might happen again, the best way to deal with this is start buying BTC every week, maybe on Mondays?
Why we should buy BTC on Monday? The price drops not always on Monday, sometimes the price drops in the middle or at the end of the week. So, there is no exact day to buy Bitcoin, it depends on the current trend in the market. You also must know that it is not a must to always buy Bitcoin every week.