Captive nut fibreglass help

[MrChips]

Morning all! Hoping for a bit of advice from anyone with fibreglass experience.

I previously had repaired with the same captive nut just with filler but this has all but worked itself loose. This is mostly hidden from view so doesn't need to be the most visually appealing repair but as a minimum it needs to stop the issue getting worse.

Here's the culprit:



So.... how's best to repair this and ensure the captive nut remains supported??