My iPad is locked to owner

This would suggest that you are not the original owner of the iPad - and have either purchased or aquired an iPad that has not been properly prepared and the Activation Lock disabled by the previous owner. Unless you can secure the assistance and cooperation of the previous owner, the iPad is (and will remain) useless to you.

If instead you are the original owner, but have switched to using a different AppleID account, you must recover the previous AppleID credentials with which to satisfy the Activation lock.

Here are the Apple support pages that outline the Activation Lock - and the only mechanisms by which it can be turned off - this being the information that you, or the prior owner, will require to resolve your current issue:

Activation Lock for iPhone, iPad, and iPod touch - Apple Support

Turn off Activation Lock – Apple Support

As you will discover, unless you are the owner of the AppleID that was last used to activate the device, you’ll not be able to defeat or bypass the Activation Lock. With documentary evidence that you are the original owner (such as sales receipt showing the serial number), Apple may be prepared to assist - otherwise they and nobody here will be able to help you.

If you have the necessary documentation, Apple have recently introduced a new portal though which you may be able to request release of an Activation Lock:

How to remove Activation Lock - Apple Support & start an Activation Lock support request.

However, recovery of the AppleID credentials should be possible…

If you have forgotten your AppleID or associated password, these can be recovered here:

https://iforgot.apple.com/

To recover your credentials, you’ll need access to any one of the following:

• Your primary email address mailbox that corresponds with your AppleID
• Any of the secondary/recovery email addresses that should be configured for your AppleID account
• Any of the trusted telephone numbers (fixed line or Cellular/Mobile) that are associated with your AppleID

Unless you AppleID account has not been fully/correctly configured, or has been seriously neglected, recovery of the AppleID and password should not be difficult.

More information about recovery of your AppleID:

If you forgot your Apple ID - Apple Support

More information about recovery of your AppleID password:

If you forgot your Apple ID password - Apple Support

When you recover access to your credentials, you would be well advised to log-in to your AppleID account from a web browser - and verify/update any email addresses and trusted telephone numbers:

https://appleid.apple.com/

Sorry, but only the previous owner can disable the Activation Lock:

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Before you buy an iPhone, iPad, or iPod touch, from someone other than Apple or an Apple Authorized Reseller, make sure that the device is erased and no longer linked to the previous owner’s account.

On a device with iOS or iPadOS 15 or later that is protected by Activation Lock, you see an "iPhone Locked to Owner" screen when you turn on or wake the device. Don't take ownership of any used iPhone, iPad, or iPod touch if it's protected by Activation Lock. 

If you don't see that screen, follow these steps to check if the device is ready to use: 

1. Turn on and unlock the device. 
2. If the passcode Lock Screen or the Home Screen appears, the device hasn't been erased. Ask the seller to follow the steps below to completely erase the device. Don't take ownership of any used iPhone, iPad, or iPod touch until it's been erased.
3. Begin the device setup process.
4. If you're asked for the previous owner’s Apple ID and password, the device is still linked to their account. Hand the device back to the seller and ask them to enter their password. If the previous owner isn't present, contact them as soon as possible and ask them to use a browser to remove the device from their account. Don't take ownership of any used iPhone, iPad, or iPod touch until it has been removed from the previous owner’s account.

A device is ready for you to use when you see the Hello screen.

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copied from: Activation Lock for iPhone, iPad, and iPod touch - Apple Support