Hi… I don’t have a huge personal experience from telegram groups, I’ve only tried a group for 2-3 weeks and I got twice in this period comment-blocked! And it was the first time in my account’s life that I was comment-blocked. So I left the telegram group, I don’t think that was a coincidence.
Since June I use Dm groups and it’s working so far absolutely and that’s what I personally can recommend.
That’s my 2 Cents. Good luck, unfortunately I am not in this niche.