OP is probably looking for something similar to Telegram or Discord(I could be wrong though). but if OP is also looking for a forum, this one is pretty active.
Probably OP can be looking for groups on social online places like Telegram but this forum can be enough for some discussions. If it is about betting predictions, he will need a group for that on Telegram. I have a friend that told me that they are many on Telegram that post about odds and the matches that can be good for betting but I was not interested. Everything that I discuss about gambling is not beyond this forum.
What could OP probably be looking for that isn't in the gambling discussion board of the forum? Most communities in Telegram and Discord are full of scammers. The forum is the best as far as I know. Although there are other communities on Reddit. Perhaps he can try there, but i bet he can find any community better than the forum especially in terms of gambling.