I am currently doing my Master's degree in Computer Science. So far, I am at the very beginning of my work, just started with the research. My supervisor is the same person who supervised me during my Bachelor's. I was very satisfied with collaboration with him. The idea for my Master's was to build on the grounds of the application that was build during my Bachelor's. That was planned from the start of our collaboration during my Bachelor's.
To be honest, I was not very satisfied with the application created for Bachelor's thesis, because I was working and doing double degrees at the same time and created it in a big hurry. Furthermore, I believe that I was able to defend my thesis on time hugely because of my promise to improve the application further during my Master's.
Here comes the problem - I am no longer interested in my Master's thesis topic that much. I came up with another idea, which would include changing the field of research, hence, changing my supervisor. The new idea makes me way more excited, because it is associated with my hobby. I believe that changing the topic would dramatically increase my motivation resulting with a better outcome. All of that makes the decision quite tough for me.
To sum up - is it okay to abandon my supervisor and the improvement of my application written for my Bachelor's despite the promise? Thank you very much in advance.