History has show so far that Bitcoin has recovered from all of its previous lows and hit higher highs. There may come a time when it will never be under $10,000 again. It's not necessary to buy 1 full BTC at a time. Just get what you can at the time on the dips and keep adding to your BTC total and HODL!
it will be good if we can divide our money to buy bitcoin at any price because we have much opportunity to sell at any price too. and if we don't have money to buy 1 btc, then divide the money is a good solution for us. I always keep telling my friends that they need to invest their money in bitcoin and they can buy at any of price. some friends follow my suggestion and some of them are not but I don't think too much of them which doesn't follow me.