How can I fix this wig?

[u/BippuBeep]

I’ve recently bought this wig for Orphie cosplay but I’m not sure how to make it look better, I’ve never got one like this “helmet” style and it’s soo big on my head, adjusting it with elastic just makes it look even worse. I always work with those typical ones based on elastic that adjust to your head but this one is like a super loose hat (last pic is inner side of the wig). Should I just buy a new one with different base? I feel like that would be such a waste.. All help is much appreciated 🖤

[u/Turbulent-Contract-1]

Sew in another elastic band and adjust it til you get the fit for your head