Simply put, it is impossible to become an expert on Bitcoin. Because we talk speculatively about Bitcoin. It's not just us common people who invest small amounts in Bitcoin. There are many institutional investments and there are many large whales. They can change the price of Bitcoin anytime they want. Therefore, it is not possible to predict the future value of Bitcoin, only speculation.
Most are just self-proclaimed experts. Because even long-timers in this market are only speculating, it means, they also don't know the exact price of btc for those speculated times. They are also basing their predictions from past history, market progress, adoption among other things. So no one can claim that they know what's gonna happen in this market few months down the lane.
Because if someone will claim he knows what's gonna happen, then he is just a hypocrite person as no one has the crystal ball to know the future of this market. So basically anyone is just a speculator, predictor or whatever you call them.