If you want to redirect your customers to "My Account Page" then go to Stores > Configuration > Customers > Customer Configuration > Login Options > Redirect Customer to Account Dashboard after Logging in > Set "Yes" else if you want to redirect to your custom page then kindly add the following code in your "di.xml".
In [vendor]/[module]/etc/frontend/di.xml
<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
<type name="\Magento\Customer\Controller\Account\CreatePost">
<plugin name="createpost_plugin" type="\[vendor]\[module]\Plugin\CreatePostPlugin" sortOrder="1" />
</type>
</config>
and kindly create a new file CreatePostPlugin in [vendor]/[module]/Plugin/CreatePostPlugin.php and add the follwing code
<?php
namespace [Vendor]\[Module]\Plugin;
class CreatePostPlugin
{
public function afterExecute(
\Magento\Customer\Controller\Account\CreatePost $subject,
$result)
{
$result->setPath("[route]/[controller]/[action]");
return $result;
}
}
Thanks and Hope this helps.