Older iPad are worth nothing for trade-in value now.
Your over 8-year old, iPad 4th gen model is too old, now.
Apple ended support for 8-10 year old iPads, at least, well over 3 years, ago!
Virtually, all third party iOS app developers ended/stopped/abandoned supporting these old iPads over two years, ago!
There are virtually, NO MORE older iOS 9 or 10 compatible apps available from the Apple iOS App Store, any longer.
There are also, virtually, NO MORE popular or useful apps or games for these old iPads, any longer!
Especially multi-player games as game makers push for upgrade compatibility for best interactive user and cross device gameplay.
Simply put, your 4th gen iPad is too old and obsolete now.
Sorry, but this is the reality for ALL 8-10-year old AND OLDER iOS devices now. Especially going into 2021!
These old 8-10-year old iPad models are worth nothing for trade-in value today.
Sorry.