For a number of reasons, I’ve recently set up new OpenPGP keys, and will be transitioning away from my old one. I use Thunderbird and the Enigmail OpenPGP extension to encrypt and sign my email communications. Check out the Security in a Box documentation if you wish to do the same.
You can read the full statement of transition from this archive which includes details about old/new keys, signatures etc. My personal OpenPGP key has been updated in the contact page. I’ve also advertised this change on social networks I use frequently.
If you haven’t done so, I recommended checking out the Riseup OpenPGP best practices documentation.