Is the Apple app Cleanup ok to use

To add to suganhkishore's advice, may I add that the app Cleanup is not an Apple app, as you suggested. Yes, it is available in the Apple App Store, but Apple did not develop it. If you want to optimize the storage on your iPhone or iPad, see the advice below. It does not require an app.

Optimize the storage on your current iPhone.

You can do this and possibly free up space, by deleting apps, deleting old photos you no longer need, old emails & messages. You can read more about it here: How to check the storage on your iPhone and iPad - Apple Support

hello,

There is nothing you need to clean up.

Any app trying to sell you some service you don't need is a scam. Avoid it.