Came to basically say the same thing. Parts also on AliExpress, looks like the same pictures from eBay so might be the same products. “Fixing” the plastic joint that has so little surface area and is mangled as much as it is seems like it would be dubious at best.

If it were me, I would be looking at buying a replacement bracket first, and if that didn’t pan out, I’d probably be looking to 3d print something that would function as a new bracket or an entirely new headband.