If you want to change the main price with a custom price attribute. You can use the below method

1. Create file di.xml on app/code/Magemonkeys/CustomPrice/etc/frontend

<?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="MagentoCatalogModelProduct">
        <plugin name="change_product" type="MagemonkeysCustomPricePluginModelProduct" sortOrder="1" />
    </type>
</config>

2. Create file Product.php on app/code/Magemonkeys/CustomPrice/Plugin/Model

<?php
namespace MagemonkeysCustomPricePluginModel;
 
class Product
{
    public function afterGetPrice(MagentoCatalogModelProduct $subject, $result)
    {        
        $result = $subject->getCustomPrice(); // you can set custom attribute price
        return $result;
    }
}