Try to learn technical analysis on your own I mean there is no website actually that will give you accurate predictions and most groups would not really help a lot when it comes to bitcoin predictions. And you need to find a financial advisor if you really need advice when it comes to your investment. If you just need predictions there are so many here in the forum in this section:
https://bitcointalk.org/index.php?board=57.0Also, there is a lot of cryptocurrency YouTuber that quite give their opinion and will teach you a lot when it comes to your bitcoin investment and trades.