The visa officer will likely ask you why you are going for a second master's degree instead of a Ph.D. Is the reputation of the university and the program very good. If that's the case, then the visa officer might be able to understand why you would like to start from scratch. Also, is the master's program you pursued in your home country related to the one you want to pursue in Germany. If yes, then it's a good sign and shows that you are consistent. If it's not related, then the visa officer might see you as desperate. So long story short, just convince the visa officer that you are passionate about the program and that the new master's program is of great quality and reputation than the one you did in your home country and can help you be a better-prepared Ph.D. candidate in the future.