My site expired in February, I would like to know how to recover it, since although I want to buy it again, it appears as not available

Was it a Pro site upgrade? If that's the case you can just upgrade it again. Click on an upgrade link in the website editor or on your site dashboard.

no me da opcion de renovar el dominio

It looks like your domain expired and was registered through a different registrar, assuming I'm looking at the correct one. Which domain is it, @markstudio?

Parece que su dominio venció y se registró a través de un registrador diferente, asumiendo que estoy buscando el correcto. ¿Qué dominio es, @markstudio?