Even after deleting many apps and photos there are no space left

Delete “other” storage by open Settings > Safari and choose Clear History and Website Data. If you have a lotof Safari tabs open on your iPhone, you might want to close most of them, too.

same for WhatsApp, go to WhatsApp settings > storage and data > manage storage and start deleting the media from your contacts (don’t worry nothing will be removed from your iPhone pictures).

You might also want to change Messages to save fewer old messages. Open Settings, then Messages, and scroll down to the Message History setting. By default, Keep Messages is set to Forever, but you may want to change it to 1 Year or even 30 Days to reduce the data that the Messages app caches.