you could replace the entire awning
or tackle two different issues...
1. replace the awning motor
2. replace the fabric
This post will give you an idea about motor replacement
https://www.forestriverforums.com/fo...ng-146218.html
Once you determine your awning size you could look for awning replacement fabric, and do a search for the different types available.
A search of youtube videos will help a lot in any of these projects.