How do I get rid of the outline of an old bathroom light fixture?

I replaced the light over the mirror/vanity in my bathroom with another wall bracket fixture. I painted at the same time, and didn't really notice that I can still see the outline from the old fixture. It's been a couple years now, and I have the time to fix it. It looks like a rectangle of excess paint. What's the best way to get rid of this? Sanding? If so, what grit?

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