Bitcointalk.org has a speculation subforum which is a good place to talk about technical analysis and such. There's definitely no need for a potentially scammy telegram group.
Just navigate to: Bitcoin Forum > Economy > Economics >
SpeculationIf you want to join other trading communities, then join Reddit's r/cryptomarkets[1].
[1]
https://www.reddit.com/r/CryptoMarkets/