Preventing Water Ingress Through Cable Conductors
First: Epoxy-ing a cable through a hole is no guarantee for anything at all, as epoxy is rigid and doesn't form cross-bonds with almost any other plastic and plastics work with temperature just as any other material. (and also: moving the cable may just as well open cracks)

Second there's a reason IP67+ enclosures of professional grade only employ IP67+ connectors (fully sealed) and no direct pass-through of cables.

If you intend on using direct pass-through you're likely going to need to fill the enclosure with something flexible, like potting silicone.

You can attempt more aggressive glues like poly-acrylate on holes and cable-ends, but those are dirty stuff and even their cross-bonding depends on the types of plastic.

Truly the only "good" work you can do for high moisture resistance is actually getting all of the right materials as you'd find in industrial applications.