Your iPad is too old for any more iOS upgrades/updates.
Sorry.
An 2012 iPad Mini will be a 9-year old device this year.
It is too old and obsolete now.
It's 2021 now.
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, refurbished or used iPad models, from better known, trusted Apple product/device retailers/resellers, locally or on the Web/Internet, capable of running the latest iPadOS versions. There are PLENTY of newer, older iPad models that can run the latest, current versions of iPadOS.
Sorry & Best of Luck to You!