It's very important to study the market to be sure of the potential movement before buying a particular coin but for BTC, I think we all know that buying when there's a dip in price will always be profitable. I know we can't be too certain with the way we understand and predict the market but to an extent, we can make good decisions in Bitcoin because it can be easily predicted more than any other coin. Personally, I think saving money in BTC isn't a bad idea and should be encouraged
Can you imagine the faces of those people who bought Bitcoin at around $95k? What will they tell you now? I don't think they will be pleasant words and wishes to you. Therefore, it is not always possible to make a profit if the price of an asset has fallen. The trend can be very protracted.
Just recently I saw a video where a girl and her boyfriend were crying because they lost more than $100k in a few hours. They will have to sell their only home to pay off the debts they took from the bank to buy Bitcoin.