These days will happen when you get stuck and can not think of a single thing to write. Here are some tips to try:

1) get away. Take time away from your story and come back later. You may need to see it with fresh eyes.

2) start writing. Jot down random things that come to mind. Make a list, write how you feel.

3) fresh air can always help. Go for a walk or jog.

4) this may sound weird but it is how I got the idea for what if. If you are doing a fan fiction, role play the part you're on. It may give you new ideas to use.

5) ask a good friend or family member to read it and give suggestions.

6) take your story line and make a calendar. Write what happens what day. Put yourself in the characters shoes. What would you do next?

7) is the story so predictable it's boring? Add twists! Take a character and turn them evil. Add more conflicts and cliffhangers. Everyone loves the suspension of twists. ( I do anyway)