As your project ended and you have announced a new rule you have to send a message to all the people so that they can know about the rule. You should create a pinned post on telegram update it on bounty thread and also post all of your social media sites and along with those you should send them a private message. Otherwise, I think 70%+ people will not be able to fill the KYC and later they will spam by saying give my payment! give my payment!