Sometimes it's a good idea to take a moment to get in touch with your characters to get back up to speed. This could be for several reasons, including if you had to take a break from writing for some time or maybe you're feeling a little disconnected from your characters. Let's face it, life can interrupt the little fantasy world you've created, and it's sometimes difficult to get back on track.
So what do you do?
I write notes about each character and consider what's going on with them during different points in the story. What are they feeling? Do they have an issue that's been on their mind? How are they getting along with other characters? What are their fears or worries? What have they done recently or plan to do in the future?
Catching up with your characters is similar to catching up with old friends. You want to get a sense of where their headspace is or what's going on in their lives. However, just like everyday people, some characters are more forthcoming than others. You may hit a few walls at times, and if that's the case, you have no choice but to accept it.
Remember that your characters are the blood in the veins of a story. Regardless of how great the concept unless the characters are relatable, likable, and compelling, the reader might lose interest. For that reason, staying in touch with your characters is an important element in the writing experience.