Create a function in your resourceModel like this

namespace Module\Namespace\Model\ResourceModel;

class Inventory extends \Magento\Framework\Model\ResourceModel\Db\AbstractDb
{
    public function truncateTable()
        {
            if ($this->getConnection()->getTransactionLevel() > 0) {
                $this->getConnection()->delete($this->getMainTable());
            } else {
                $this->getConnection()->truncateTable($this->getMainTable());
            }
    
            return $this;
        }
}

and call this function from any file in your custom module. This must delete the table related to the resource.

Create a function in your ResourceModel

app\code\Module\Namespace\Model\ResourceModel

Inventory.php

<?php

namespace Module\Namespace\Model\ResourceModel;

class Inventory extends \Magento\Framework\Model\ResourceModel\Db\AbstractDb
{
     protected function _construct()
     {
          $this->_init('your table name', 'primary key column name');
     }
    public function truncateTable()
        {
            if ($this->getConnection()->getTransactionLevel() > 0) {
                $this->getConnection()->delete($this->getMainTable());
            } else {
                $this->getConnection()->truncateTable($this->getMainTable());
            }
    
            return $this;
        }
}

And call this function from any file in your custom module. This must delete the table related to the resource.