This is a very old iPad model ( nearly 9-years old, now ).
I would stop trying to use 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.
Here's is the ONLY third party Web browser, I recommend using on very old iOS devices, that has been newly created, at its start, by its lone developer, approx. 1 year, ago, specifically to run on older iOS devices all the way back to the beginning of iOS 9 and its developer has since released quite a few major and minor browser updates throughout the 2020 year, making this Web Browser as feature rich as possible, while expanding its usefulness to both old and new iOS/iPadOS versions/devices, while still optimising its code to perform its best on very old iPad models.
Pay for and install this third party Web browser, from the iOS App Store, called Alook browser.
Tap the iOS App Store link below.
https://apps.apple.com/us/app/alook-browser-2x-speed/id1261944766
My family still uses older, nearly 9 and 10-year old iPad 2 and 3 models and have had every one of them pay for and download this third party Web browser on all of their older iPad 2, 3 and 4 models.
I just tested this Web browser for my local banking Website on my own iPad 2 and I was able to login with my bank user ID and password and view my accounts and initiate an online transaction with no issues.
Give this third party Web Browser a try.
For any other apps, Apple ended support for 8-10 year old iPads, at least, over 3 years, ago.
The internal hardware in that iPad is too old, too underpowred and completely incompatible with all later versions of iOS/iPadOS.
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.
There is one last thing you can try/attempt, if you need an older version of an app.
If you own much newer iOS device that can run either iOS 12 and.or iOS/iPadOS 13 and later, you can install the most recent app/s onto that more recent iOS device.
Then go back to your older iPad, open the iOS App Store, go to the Purchases section of the store app, search for the app/s you wish to try and download to that older iPad and see if an older version of the app is allowed to be downloaded/installed to that older iPad.
These newer iOS/iPadOS devices must use your same Apple ID user account and password.
Failing that OR IF NO joy, then there is nothing more to be
Simply put, that 3rd gen iPad is too old and obsolete now.
Sorry, but this is the reality for ALL nearly 9-10-year old AND OLDER iOS devices now. Especially going into 2021!
If you need/want an iPad with an up to date iPadOS with access to current, updated apps, then you really need to seriously consider a new iPad model OR a much, MUCH “newer” and less expensive, used iPad models, from better known, trusted sources, like other Apple product/device retailers/resellers locally or online, capable of running the latest iPadOS versions.
There are plenty of newer, older iPad models that can run the latest, current versions of iPadOS.
Best of Luck to You!