Wires keep breaking due to bending

Hi, I am building a switch panel with a leo bodnar bbi64 board and some dupont wires I've got on amazon.

As you can see they are very thin, which is great as I'm using loads of them so helps for packaging. The issue is that some of them are breaking, mostly because during debugging, I am opening the enclosure quite often and moving cables around.

What's the fix I should do? I thicker wire with more strands will create multiple issues of packaging and i would need to crimp the terminals. I was thinking on using a glue gun but not sure if this will solve the issue.

Thanks in advance