How to write a good fanfiction or book!

To celebrate over 500 reads on my book, "Forever, 'till the end of time: A Foxy x Mangle fanfic" I am going to make this book so all you writers on Wattpad can get some tips and/or details that can improve/help your writing. I'm not saying everyone on Wattpad should improve their writing, definitely not. But if you do feel as if your writing needs a bit of help, well, you've come to the write place!