Does the Bitcoin price go up or down?
It would be better if you asked your question in a much more precise way :
"Will I get rich if I invest in BTC now, as was the case in 2017?" There is no right answer to that question, for the reason that no one here is a prophet, nor does he see into the future. The fact that investing in BTC has so far always paid off, and also the fact that after halving, the price has taken a big jump, so if one wants to go in that direction, it's all a matter of risk someone will take.
If I have, say, $1000 that I don't necessarily need and won't need in the near future, and if I invest in BTC there are 3 possible outcomes. The first is that in about a year or a year and a half I maybe have $10 000 worth of BTC., Second is that I may lost 50% of that amount due price dump and have only $500 - and third is that the price will remain the same.
If we think that way then we don't really have to be burdened with the price, invest only what you can afford to lose and hope for the best.