Anyway both dragonfly and gravestone usually turns out to be good signals for profitable trading, but the last dragonfly doji I see needs to be confirmed by the next candle, I wouldn't recommend to buy right now.
You might be rushing toward make your predictions. I have seen lots of times that candle sticks go void like a trend reversal appear and suddenly another pattern indicates the just opposite one. Like you mentioned, you must wait for the confirmation by the next pattern because as of now market seems gaining strength for another stronger rally toward $12k levels by end of this May month. Because halving is due on this month. Hence there are very less chances for market to remain bearish.
More importantly, China and New Zealand announced about their triumph over the pandemic. Many other countries are loosening the lockdown restrictions which may lead to restore of economy and bitcoin may keep attracting investors which may add more support toward another rally.
