Take a stroll outside
A small walk to the park or a shop can help you form an idea take your characters with you for a walk. An idea will usually pop up for example Mary and Mark decided to meet at the park and you continua walking towards the park.... what happens next .....a black car passes by and Mark gets shot.....continue walking what happens next .....Mary screams as the car speeds away. ....and you continue walking as an a scene is played in your mind,
Do something different
Go to the museum or art exhibition or cook or paint just do not write on that day but create a story in your mind when you are looking at a painting or cooking for example.....Stefano paintings had a hidden secret each of his painting represented something a strange secret displayed five paintings.....each painting tells a story.....what is Stefano hiding.
Take a short holiday
Go on a holiday and create a story describe your surrounding in a note book and try and incorporate it in your book maybe you never thought of your characters taking a holiday and now you characters have taking on example...they landed on the beautiful islands the water was clear blue with coconut trees everyway.....but the Island looked deserted where is everyone.
Clear your mind
Take a break and clear your mind and relax do not think of your book or your characters just RELAX and do some yoga.