I can’t download any app using my apple id

Depending on the error message that you get, first check in Settings, your name, Shipping and Payments to check that you payment card is still valid and in-date.

If that fails contact Apple Support directly. Depending on your region, you may be able to reach them here: contact Apple Support 

Please see If you can’t download or update apps on your iPhone or iPad - Apple Support.

Cheers,

Jack