Here is an example of how you might improve the DecoratorManager class provided above:

1. Use dependency injection to pass the dependencies instead of passing them through the constructor.
1. Add more abstraction by creating an interface for DataProvider and implementing it in the DataProvider class.
1. Use better exception handling by catching specific exceptions, logging them and returning a meaningful response to the user.
1. Use a caching strategy that allows for configurable cache expiration time, rather than hard coding it.
1. Validate the input data before passing it to the parent class to ensure that it meets the required format.
1. Use a caching library that supports tagging, so that it's easy to invalidate the cache when the data changes.
1. Add more test case to cover all the possible scenarios.

<?php

namespace src\Decorator;

use DateTime;
use Exception;
use Psr\Cache\CacheItemPoolInterface;
use src\Integration\DataProvider;

use Illuminate\Support\Facades\Log;


class DecoratorManager extends DataProvider
{
    public $cache;
    public $logger;

    /**
     * @param string $host
     * @param string $user
     * @param string $password
     * @param CacheItemPoolInterface $cache
     */
    public function __construct(CacheItemPoolInterface $cache, string $cacheKey)
    {
        $this->cache = $cache;
        $this->cacheKey = $cacheKey;
    }

    /**
     * {@inheritdoc}
     */
    public function getResponse(array $input)
    {
        try {

            if (!$this->validateInput($input)) {
                throw new InvalidArgumentException('Invalid input data');
            }

            $cacheItem = $this->cache->getItem($this->cacheKey);

            $cacheItem->isHit() ?? $cacheItem->get();

            if (!$cacheItem->isHit()) {
                $result = parent::get($input);

                $cacheItem
                    ->set($result)
                    ->expiresAt(
                        (new DateTime())->modify('+1 day')
                    );
            }
            return $cacheItem->get();

        } catch (InvalidArgumentException $e) {
            Log::error($e->getMessage());
            return ['error' => $e->getMessage()];
        } catch (Exception $e) {
            Log::critical($e);
            return ['error' => 'An unexpected error occurred'];
        }

    }

    
    protected function validateInput(array $input)
    {
        // Validation logic goes here
    }
}