How to decline PhD offer correctly
I recently got accepted into a fully-funded PhD program in Japan and consented to take it earlier this year. However recently i have realized that my mental capacity and overall state are affecting me a lot and i might not be able to pursue my studies in Japan. The problem is that my future phd supervisor was also one of my professors at my masters course. I still want to pursue PhD in the future but not in Japan so I am afraid that my decline might lead to them not wanting to give me any recommendations in the future. Is it possible? Is there a way to decline the offer correctly so it does not lead to any negative consequences? Or maybe I can use their previously written recommendation letters? Please share your thoughts, opinions and experience