iPhone 7 - Can't update apps
If you can‘t select „None“ you must enter some payment details to re-enable your account. So either get your PayPal account fixed, create a new PayPal account, or get a credit card (or ask Antriebs to help you out with one). 

If all these options are unavailable to you right now you can try tinsort it out with Apple Support. Contact details depend by country etc but can be found at the bottom of apple,com.