How do I make my nail polish last longer?

I am looking for tips. I wear OPI nail polish, and just lately it has been chipping sooner than it used to. What could be causing this? I don't think they have changed their formula, but this is frustrating. Nothing is any more frustrating than working on your nails and having them chip sooner than you would like. Could it be the weather, or something else? I do not know exactly what could be causing this. Frustrated!!! Thanks for any tips.

How do I make my nail polish last longer?
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