I wouldn't even bother with this iPad, any longer!
When you did complete full reset the device ( Erase All Contents and Settings ) to a new device state now, and for these 8, 9and 10-year old iPads, this act of the complete device reset means a certain level of operational “death”to these very old iPads, for good, after the fact.
What should have happened is this iPad needed to be backed up to an older version of iTunes on a computer before you did the full reset.
Older versions of iTunes ( version 12.6.5 or earlier ) for Mac or Windows P still save the complete installed app/s to the computer as part of the backup process.
Something Apple eliminated in later versions of the iTunes application ( versions 12.7 and newer ) for Mac or Windows PC.
A 2010 1st, gen iPad is an over 10-year old device, now ( March/April 2010 )!
These older iPad models are too old, now, too underpowered and completely incompatible with any of the current and future versions of iOS/iPadOS.
It is what it is, today, in the year 2020!
These old iPad 1, 2, 3, 4 and 1st gen iPad Mini models are, at least close tp 8 years old and even older,now.
The amount of older, compatible, available apps for these old iPad models has dwindled significantly since the beginning of 2020!
Getting older versions of apps for these old iPad models, initially from Apple’s iOS App Store is getting very difficult and very problematic and this issue is getting, painfully, much worse, now, in 2020!
As of the beginning of 2019, many, MANY third party app developers are all more quickly and completely permanently dropping older app support for all old 7, 8, 9 and 10-year iPads that are running 2-3 year old and earlier iOS versions ( iOS 10 and earlier ).
Third party app developers are removing all of their older, legacy versions of their apps from Apple's App Store servers, now.
Third party app developers no longer want to support these 8, 9 and 10-year old or older iOS devices, any longer!
Older versions of apps are, soon, going to be gone for good, now!
These old iPads are now reaching their complete end of life and support cycles.
So finding older versions apps for older iPads, while still possible, currently, will be a very tough challenge, now, in 2020.
Old iPads that can no longer be upgraded/updated will have NO MORE APPS AVAILABLE for initial download, at all, soon, from the Apple iOS App Store, for such old iOS devices in the very near future.
Older versions of apps for these older iPads will be completely gone, at some point, in the very foreseeable future.
Old 8, 9 and 10-year old iPads will be pretty much obsolete by the end of the 2020 year!
Again, it is what it is, today, in the year 2020!
You will never get any more older versions of popular apps for these old iPads, any longer.