[owlpower]

I am having trouble drawing the resonance structure here.

I can't see where to draw my curved arrows. I know that N is most electronegative here, so I am aiming for my negative charge to be on N.
Any hints is much appreciated.

[mjc123]

You are aiming wrongly. What happens when the lone pair of N becomes involved in the delocalisation?

[owlpower]

If the lone pair takes part in delocalisation, then N will have a positive charge.

[Babcock_Hall]

In the structure for the ammonium ion, there is a formal positive charge on nitrogen.  There are many compounds which have a formal positive charge on oxygen as well.  Therefore, I would not rule out a structure solely on the basis that an electronegative atom has a positive charge.  I acknowledge that when deciding on which resonance forms make a large or a small contribution to overall resonance hybrid, that several factors come into play.

[owlpower]

https://imgur.com/a/gZFm5Zv

Thank you for the input, I came up with these resonance structures!

[mjc123]

The one with 4 charges is highly improbable!