The last bull run had everyone on the tip of their toes, a lot of people strongly believed that Bitcoin's (BTC) price was going to reach, or possibly cross, the $100,000 price range, which never happened. And there were some who had unbelievable expectations like $500,000 and above, lol (we all know that's not happening anytime soon).
Some people believe everything they hear and read, and there are so many so-called experts who were fascinated by the $100 000 and they repeated it like broken records. The same thing happened at the end of 2017, only the numbers in the game were much smaller.
Now with the recent events that have taken place, we all can see the bull rising off the dusts, we can almost tell it's about to happen again, maybe by next year or two. 
Which events are you referring to exactly? The whole story about BTC ETFs obviously didn't stimulate the market too much because most people don't understand the difference between futures and spot ETF anyway, and regardless of the powerful players that are involved this time, there are no guarantees that such an ETF will be approved in the US.
The only thing that is certain is the halving, but in that case it should be taken into account that even the last halving brought rather modest results compared to the halvings before that. It is realistic to expect that the price of the last ATH will at least double, but past results do not guarantee that history will repeat itself.
