Choosing the best topic for case study research involves the following: 

• Go for the topic that interests you about that particular subject. 
• Your topic must relate to the real issue or challenge in your field. 
• The topic should be relevant to your field and should bring significant contributions.
• Review existing literature to find out areas that need more research and have study gaps. 
• Finalise a topic for which you have resources, time, and budget. Always check the feasibility. 
• Your topic should contribute new insights and fresh ideas to the study area. 
• See whether you have the availability of the case for that particular topic. Look for the organisation or community that you can use. 
• Assess whether your chosen topic aligns with current trends and problems in the field. It will ensure a more significant impact. 

A successful case study project starts with a perfect topic. However, students often get stuck at this stage. If you are in Germany and facing the same issue, fortunately, you can get quality help. There are many dissertation helpers in Germany who can assist you in choosing a topic that has both academic as well as professional impact.