I remember before, and way back in 2017, the bull starts on September way up high in decemer 16. I think the market is quite too early now, but if the bull run will drive the financial assets of cryptocurrency as high as possible, we can start investing today since the market price for now seems not that big enough if we are going to consider the all time high soon.
I am not sure the bull RUN of today will really follow the pattern of 2017, if we look at the period the LAST bull RUN used calls for alarm, the bull really lived a short live then and that is the repercussion of it today, the short live of the last bull discouraged the investors from the market and they saw it as an unreliable coin for store value.
I want to personally believe that this pattern of slowly increasing is what bitcoin will follow till it gets ATH. From this pattern, many investors will get use to the increase along the line and will not be strange things for them that will prompt them into dumping the coin abruptly.