Having received a diagnosis from an Apple technician, you have very likely exhausted steps to revive the iPad. Out-of-warranty repairs of an otherwise undamaged iPad are charged at a flat-rate - this typically being c.60% of the “as new cost” of the device.
For qualifying devices, in lieu of attempting to repair and return your existing iPad, Apple generally offer a rapid exchange for a reconditioned/renewed iPad of the same model and specification - this being much quicker, often being an immediate exchange.
If this cost is unpalatable, you might put the potential repair cost towards that of a much newer and more powerful model, such as the current equivalent iPad9, or the just announced iPad10.
Otherwise, you might try recovery of your existing iPad yourself.
If you can't update or restore your iPad - Apple Support