You can simply use the YouTube Website through a Web browser, instead.
The YouTube app is just, basically, a portal into the Website, anyways.
Most streaming apps are just portals into the actual Websites, anyways.
I would STOP using that well over 4-year old default iOS Safari Web browser as it is too old, not secure and not safe to use to access the Internet, any longer.
There are virtually NO MORE third party Web browsers left for 8-10 year old iPads!
Available and more popular third party Web browser choices are pretty much GONE, now.
If you must use these old iPad models, here is what is left for still updated Web browsers.
Pickins’ are slim, now!
ALook Web browser ( A fairly new Web browser primarily designed for old iOS device versions, but is still available to newer iOS/iPadOS devices, as well )
Dolphin Web browser
Maxthon Web browser
TOR private browser
TOR + VPN private browser
Turbo VPN private browser
This is pretty much it for iOS 9/10 compatible, updated, third party Web browsers today.
Then just go to the YouTube Website, and login to the YouTube Website using your YouTube login credentials.
This will be a slower way to access YouTube, but IT WILL WORK!
Best of Luck to You!