Accurate and reliable crypto signals can only be generated through careful market analysis. Only a few services like
https://www.fatpigsignals.com/ do this kind of thorough analysis.
I'm learning how to trade crypto and I agree with you that accurate and reliable signals can only come from good TA/FA. I don't recommend depending on trading signals other people. Do your own research so you take be comfortable with your trade. Trading on signals from channels is like gambling and one can blame them for your loss.