Of course you can't, they're just guessing. If anyone can guess the future price then they're just guessing, I've read a tweet made in 2014 that 2024 price will be $100k, of course if we were in 2014 when the price was around $300 would laugh and think he's crazy, but now everything that is guessed might happen, but guessing the future price is of course something that anyone can do.
One can obviously not guess the future but charts, analysis, past price actions, market sentiments, global news, and a bunch of other things can help us have a general idea about how the price might react next, and that is what experts base their predictions on which might not be accurate but they get close most of the times and I believe that is more than enough to at least have a close estimate of the future price movements.
We might not be experts and our estimates can be wrong most of the time, but we should never cease to try at least because you learn from your mistakes. So if I say what I feel, I believe the market won't be able to go up at this point because Bitcoin's price is too stable after reaching $30k, showing clear signals that the resistance is strong and it doesn't have enough buying power to go across it.