In my experience, long distance is pretty tough, especially given that there’s nothing substantial/physical.
Try to supplement your relationship by experiences. Like you said, watching movie together/ reading books and talking about.
Make sure there is a way to express one’s feelings when the other isn’t available. Like enabling voice mail, sending video messages, toys, recording reaction videos when you know your partner is doing something for you.
And also a way to show frustrations/anger and acknowledging that. Otherwise you wouldn’t even know whats eating the other person.
Again, all of this might not be the case for everyone