At this time of year is not a good timing to buy a bitcoin because the prices are running high. I understand that the 600$ is not a lot but I do not see the profit because this run will not be going on forever. I hope that you can get your profit even at this ATH in the bitcoin prices. On the other hand, that amount could have helped you subsidize your expenses in goods for daily needs.
Better to dollar cost average then don't buy at all, look at the price of Bitcoin completely getting parabolic. Sure it may come down and have a flash crash. But if you look at the wider picture. Institutional and big companies are coming in. Grayscale invested billions of dollars, billionaire's putting 1% of their portfolio into BTC. Many other people felt they've missed the boat and looking for the opportunity to buy in. Shorting BTC now would be disastrous when price starts to take off.