Changing your style is a very delicate subject. It can either sky rocket your name, or destroy it. People can either view you as brilliant and diverse, or a sell out who has lost their mind and just hopped on the bandwagon. Are you a trend setter, or just following the trend? Neither is technically bad, but everyone has their opinions.
Many creative people want to grow and expand, but you run the risk of alienating your fan base. This is true to everything in life and there are tons of factors that create change, like age, finances, love, drugs, dreams, happiness/unhappiness, and literally anything under the sun. The hard part is to get the people that rely on you and your creative mind to grow with you and your vision, and not feel abandoned. On the flip side though, changing your style can open you up to a whole new audience, and can help your creative mind flourish.
There is so much to say on this topic, so I'll probably have to split it up into separate parts. I have no immediate answer for how to go about it the right way besides... Follow your heart. This act of switching up your style, or even just expanding your style can be quite baffling and many are insanely scared to take the risk. Especially when fans are so quick to abandon their allegiance to you. Some people approach it gradually and seamlessly to where very little even notice the change over time, or some people just slam it in your face unexpectedly. I myself think it's best to either do it gradually, or create a new alias if you want to start immediately, but I assure you that people are not stupid. Most people that know you, or follow you, can tell if you are not genuine or true in your change. Like anything, if you do something for the wrong reasons, it will come back and bite you in the ass.