“for a change” is an everyday expression used to mean things like “something a little different this time,” “just for a change of pace,” or “to do things differently for once.”
It is also commonly used in academic or business meetings, and while the nuance is mild and casual, it can be very helpful for speaking natural English.
This expression is mainly used to emphasize a choice that breaks away from routine daily habits or repetitive situations. For example, it fits naturally when trying a different approach to a presentation you usually give the same way, or when making a new suggestion in a meeting that is different from the topics you usually discuss.

5 example sentences
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I gave my presentation on a different topic for a change.
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I attended this conference as an audience member for a change.
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We usually focus on clinical work, but this time we tried basic research.
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I usually give the presentation, but this time I served as the session chair for a change.
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I'm thinking of joining a conference in a country other than the U.S. for a change of pace.
just for the heck of it: just because; for no particular reason.