I need help?

Well, a lot of them are either about life in general or about nature. Since life is generally a hard topic to yze, you might want to use nature. Go for a walk or a hike, go to a park or out in the garden. Take a look at the plants, the birds, the sun, whatever you can find, and write down a couple adjectives for each thing. Afterwards, look for a theme linking all of them-morning, life, tranquility, energy, whatever. Use the adjectives you wrote down (and any others you think of) along with the objects you saw, and write about the theme with them. Tweak the line lengths, the rhymes, and the words to make it fit the form of your sonnet, and you're done. Hope this helps!