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If you own another much newer iOS device that can run iOS/iPadOS 13 and later, you can install the most recent app/s onto that more recent iOS device. There is one last thing you can try/attempt, if you need older versions of apps. These iPad models will soon be 7 and 8-years old, in 2021. These iPad models have overall internal hardware that is too old, too underpowered and incapable of running all of the new, advanced and internal hardware resource intensive features of iPadOS. The 2013 iPad Air 1, iPad Mini iPad Mini 3 cannot upgrade beyond any version of iOS 12.
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Your iPad Mini 2 cannot upgrade/update beyond any version of iOS 12, currently at iOS 12.5.3. These apps may no longer support your iPad Mini 2.
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