How can I upgrade my ios 12.5.7 to ios 13.0

The version 12.5.7 means you have iPhone 5s, 6 or 6 Plus, iPad Air (1st generation), or mini 2 or 3, or iPod touch (6th generation). All cannot be upgraded to iOS 13 or later.

You can’t. You need a new phone. Yours is obsolete.

Same answer as above. You can’t.

I want to upgrade my iOS 12.5.7 to iOS 13