since BTC is not remained too much, some people say it may even reach $100k!!
in this manner, do you think it is worth the risk to buy bitcoin?
There's a good chance it'll reach high (or very high) values. But nobody knows when. And in between time it can also fall big and stay low for long periods of time.
Keep in mind that some bought Bitcoin in 2017 at almost 20k USD and Bitcoin has fallen during the next year to some 3k USD levels. This can be a problem for many.
Bitcoin will probably get to very high prices, but the road til there may be easy or may be tough.
So it's up to you if you consider worth it. You should invest money you are not afraid to lose or keep locked for very long periods of time.