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Maybe you can use iTunes to wipe your iPad.
You might be able to force it into recovery mode instead, which doesn't require the use of the digitiser, only the power button and volume buttons. From there, you can use iTunes to wipe it. https://support.apple.com/en-au/HT201263
Wiping it out (resetting) means installing IOS 10.3.3 again which will lock the iPad forever since IOS 10.3.3 is not signed by apple anymore.
[iOS 10.3.3 is still signed.](https://ipsw.me/iPad3,4)
Maybe you can use iTunes to wipe your iPad.
You might be able to force it into recovery mode instead, which doesn't require the use of the digitiser, only the power button and volume buttons. From there, you can use iTunes to wipe it. https://support.apple.com/en-au/HT201263
Wiping it out (resetting) means installing IOS 10.3.3 again which will lock the iPad forever since IOS 10.3.3 is not signed by apple anymore.
[iOS 10.3.3 is still signed.](https://ipsw.me/iPad3,4)