Up, but with no time frame or schedule. People like to make optimistic predictions such as "150K by the start of 2022".
It will go down at times, and might even cross thresholds.
BUT, that is the time to buy is when it goes low, and it's important not to sell it when it's low because that's the only time you've actually lost money.

There's a lot of major money in Bitcoin now, and they're selling margins when it's up and buying back in when it goes back down. The people that are constantly buying/selling are getting more and more BTC without spending more of their own money.

I don't think Bitcoin is just going to make people rich real fast like it did for the early birds. BUT, things could happen fast and it could make that crazy rise up like it did over a year ago. I bought my first amount when it was at $39,000 and I've seen it go as high as $64,000 since then.
But I'd have been way better if I started when it was still $10,000 :(
I was always scared to get in, and everyone I know says that too.
You don't have to buy a lot either. There's a strategy called dollar cost averaging that works for some people.
The first BTC I bought was with all the money the government sent me because of Covid.