If you enjoyed writing the Shakespearean sonnet, you might want to explore some more. Writing a poem like the Romantics did might be even considered easier because you do not have to apply strict rules!
As you have read on page 12 of the Bird's Eye View reader, your poem must have an individual, personal approach as it in some way or other tells the reader about your personal feelings. Themes that could be used are, for example, the supernatural, dreams, children, nature, and morbid aspects of life.
So, try to find your inner voice and write a poem of at least 10 lines.