Read a photography book, put what you have read into practice. Beautiful photos and practical information are published to inspire you.
Use a new lens it can give you a new way of seeing things.
Be more critical, more practice can help you obtain a clear idea of your strengths and skills to develop.
Enter a photography competition, tight briefs and competitions can inspire and focus you.
Set a photographic subject, this can help you develop your skills in a certain area.