I am currently an undergraduate student in mathematics coming to the end of a 4-year Bachelor degree. I have strong credentials (good marks, plus research and teaching experience) and have been doing research with one of the leading Professors in my area since the second year of my undergraduate degree. I have a couple of publications with this Professor as well and most would say I have a very strong foundation to do good research in this particular area of study during my Masters, PhD and beyond.
I have been keen on learning/studying another area of mathematics for a while now that has connections with my current area of study, though, would require me to change to a different area of research. I'm considering changing to this other topic of research for my Master's degree, both because I'm interested in doing research in this particular area, and also it would be good to broaden my knowledge at this stage of my career. Though, my current supervisor and mentors seem to have high expectations for me to continue here, and they have relatively large research group set up at my current institution that provides me a lot of undivided support.
Would it be silly for me to change universities and research areas when I already have a good setup now, or is this stage of my career a good time to move, learn and try different things before a PhD? I feel it would be better to stay in my current area as I have a good foundation here and am quite knowledgable of current research, though, I don't know many people who specialised in their research area from 2 years into their Bachelors degree. Is it a risk making this change seeing as I would have to get up to speed in the other area of research, or am I overthinking things?
N.B. Master's degree are mostly research based in my home country, minimal coursework is completed.