Lack of dynamics in a long-distance relationship.

I'm 18 years old and in a long-distance relationship with my girlfriend, who is 19. We broke up four months ago due to our immaturity. Recently, she reached out to me, and I feel that we've both grown up a bit, so I really want to give our relationship another shot. However, I’d like to ensure we have fun and keep things engaging, even through chat. The problem is that our conversations have become a bit monotonous—just talking about our days, what we did, and how much we miss each other. So, my question is: how can I make our relationship more dynamic and interesting?