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When to listen to feedback?

So five people read my Fantasy book for me and three of them said I should cut it into three sections and make a trilogy.
The first book (first quarter) My character in her isolated society cut off from the rest of the world, with an unknown disease killing off certain life forms. And her discovering what is happening and the truth about her community.
The second book (middle area) my character has left her home and ventured into the outside world to witness for herself just how bad things are for her enslaved species.
The third book - My character, desperate to survive wanders down a dangerous path of magic and power becoming involved with practitioners of dark magic, before finally achieving her goals.

That is all one book at the moment, and it's just an brief explanation. The only explanation these three people gave me for turning into a trilogy was you could go into more detail. But it would some serious work to turn 25,000 word beginning into an 80,000 word novel. I like it the way it is but I'm wondering if they could be correct. I just need some advice. Thanks

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