Get an Apple Gift Card for the value of your old device.
"Turn that iPhone, iPad, or computer — Mac or PC — you’re not
using anymore into something brand new. Send it to us and we’ll
determine if it qualifies for reuse."
Read more about Apple recycling program on their website
And, there are other websites which can help too - look up more info at the DigiSecrets website
(picture courtesy DigiSecrets)