If you think the matchmaking work is excellent and you have found your ideal partner, you can consider giving a red envelope to express your gratitude. The specific amount should be determined according to the individual's economic ability and his own situation, and there is no need to pursue high-value red envelopes too much.
Most importantly, giving red envelopes should be out of sincerity and gratitude, not coercion, so as not to cause misunderstanding or embarrassment.