$this->setTable() does not work in Model

I am new to laravel. I want to change table name to given string in the constructor in model. The code below is what I tried, but it seems not working.

Any suggestion or advice would be appreciated.

Thank you

Model

class Custom extends Model
{
protected $guarded = ['id', 'ct'];

const UPDATED_AT = null;
const CREATED_AT = 'ct';

public function __construct(array $attributes = [], string $tableName = null) {

    parent::__construct($attributes);

    $this->setTable($tableName);
}

}

Controller

$tableName = 'some string';
$custom = new Custom($tableName);
$result = $custom->create($data);

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