I took a look to your telegram group and I must say it is more inactive than it should be, considering it has about 50 members (I am assuming those are real people). If you want a suggestion, I trink it would be a good idea to find some strategies to make people to engage in conversation/ discussion, maybe have some small events about personal predictions if possible you could even offer a small reward for the user who make a correct prediction; because the inactivity is something every newcomer will notice and could be a reason for them not to join.