i have an iphone 7, and i cant download the update due to lack of space, i do not want to forcefully lose my data. is there a way to recover

Move some stuff elsewhere first.

Settings, general, iPhone storage - Show all recommendations and consider them all.

You may also find it better to use a computer to update.

Learn how to update your iPhone via recent Macs here:-->

Update your iPhone, iPad or iPod touch with the Finder – Apple Support (UK)

or older Macs and PC here:-->

Update your iPhone, iPad or iPod touch with iTunes – Apple Support (UK)