My $.02:
I think it depends on whether you can pull off the third person narrative without losing the voice of the main character you established in the first book. Of course, you will literally lose that voice going from first to third, but you probably know what I mean. For instance, will readers who get attached to your MC's narration feel detached from the story if she's no longer speaking to them? For me, that's the main question to answer.
Think of a series as one long book. Would you go from first to third during that long book? If your immediate answer is no, then stick with first. If you're on the fence about it, think long and hard about how you might do it in a single book and go from there.
I'm not sure if that helps. It's really a matter of preference, no right or wrong. Just my view. Best of luck!
I think it depends on whether you can pull off the third person narrative without losing the voice of the main character you established in the first book. Of course, you will literally lose that voice going from first to third, but you probably know what I mean. For instance, will readers who get attached to your MC's narration feel detached from the story if she's no longer speaking to them? For me, that's the main question to answer.
Think of a series as one long book. Would you go from first to third during that long book? If your immediate answer is no, then stick with first. If you're on the fence about it, think long and hard about how you might do it in a single book and go from there.
I'm not sure if that helps. It's really a matter of preference, no right or wrong. Just my view. Best of luck!