My advice is to not wait for any indicator before buying Bitcoin, you do not need to time the market to perfection when to buy, you can buy while the market is down so you can buy more amount of Bitcoin than to buy when the naketyis rising although that is also another strategy but you need to be very accurate to get this strategy correctly. The market sentiment is neutral and not bearish of bullish. It can change at anytime but for now you do not have to panic to buy or sell. Also you do not have alot of time to be waiting for when you are going to buy because the market can move very fast and change sentiment. Start buying if you want to make profits when Bitcoin gets to a new highest price. If you keep procrastinating when you will buy Bitcoin because you do not know what the sentiment of the market is, you might miss buying totally and it means you would not be capable of gaining profits when Bitcoin pass a new highest price.