You either make your own decisions through research and thinking, or don't trade at all. These "bitcoin signal" services are 99.9% pure bullcrap anyway. If I could predict bitcoin prices accurately, do you think it would make sense for me to announce my "predictions" in a group? Of course not. I'd take advantage of it for my own.
Just choose the exchange where you will buy and sell Bitcoin. There is the current Bitcoin chart, keep an eye on this. I think if you keep calm and sell during the pump, and buy during the dump, you will be successful. It all depends on you, my advice is that you do not need to believe any analytic services and signals, this is dangerous