Consider visiting local news websites or reflecting on personal experiences. You might also try chatting to friends to see if they have any suggestions. My supervisor says you can use personal examples to prove your thesis (as long as they don't sound made up). For example, "John's enthusiasm for football is evident from his frequent comments about the sport. Also, we know that John likes green eggs and ham because he has told us so himself." - this is a valid example. In addition to these strategies, there are several online sources where you can find sample essays and thesis statements. One site that may be useful is Essay Wizard. They offer free samples of academic papers along with advice on how to write them. You should also check out these websites: Sample Theses, Academic-essays.com, and Best-essays.com. Finally, remember to read other people's essays before writing your own. This will help you improve your argumentation and reasoning skills while giving you ideas for your own paper.