How to fix this wig?

Wig making is not an innate skill to most of us.


First determine what a well restored wig is worth. Find out what restoring your wig might cost. Look up what skills a restorer might need, for example:

https://www.youtube.com/results?search_query=wig+restoration+human+hair

https://thewigdepartment.com/

https://www.ebay.com › sch › i.html?_nkw=used+wigs&_sop=12

so nothing removes the tangles? just want to restore it using the cheapest available stuff at home

Careful brushing is the best bet. Start at the ends and slow work your way up. Pulling might set a kink depending on what 'hair' the wig is.

I really do not think you're going to end up with a salable wig. Why not donate it and allow a professional fix it up for a needy chemo patient?

There is all kinds of youtube videos. Example.