I read a minimum one screenplay a week. And try and watch as many movies as I can. Old and new.
If you can.
- Read the screenplay.
- Watch the movie.
- Reread the screenplay.
Also read as much as you can.
You never know where that next idea might come from.
Keep feeding that imagination you have with as much information as possible.
Don't forget to write ideas down as well. Get yourself a little black book.