iPad2, iPad3 or first generation iPad mini can only be updated to iOS 9.3.5 (WiFi Only models) or iOS 9.3.6 (WiFi & Cellular models).
Apple ended update support for models in September 2016. They cannot be updated to iOS 10 or later major versions of iOS, as the internal hardware does not meet the minimum technical requirements for new versions of iOS/iPadOS. This limitation cannot be bypassed; these older models are all 32-bit architecture devices, whilst all recent versions of iOS/iPadOS are designed for 64-bit hardware platforms. The iPad2, iPad3 and iPad mini1 are effectively obsolete.
You may wish to consider that compatible Apps for older models of iPad are increasingly difficult to find - as third-party developers are increasingly dropping support for older versions of iOS preceding iOS11/12/13. As older versions of Apps are removed from the Apple App Store, you’ll not be able to (re)download or install them - which may severely limit the usefulness and utility of your iPad if you should you ever need reset or restore your iPad. As such, if you want or need to access most current Apps, requiring more recent versions of iOS, you’ll need to consider replacement of your iPad with a newer or current model.
Of current models, even the entry-level iPad8 has specifications and capabilities that massively outperform your current iPad - and is compatible with the vast majority of current Apps. Other models are more powerful still.
I hope this information provides helpful and succinct clarity as to your available options - and the limitations of your current iPad.
