Your result
Spain — Diaspora & Religious Return
Likely
You are already a Spanish citizen, with the full rights that carries — a Spanish passport, and the right to live and work anywhere in the European Union.
Nationality granted under the Sephardic law was granted by royal decree as a carta de naturaleza, and it is not conditional or provisional. The closure of the application window in 2019 has no effect on grants already made.
If you have not yet done so, the useful steps are the ordinary ones: swear or promise before the Civil Registry if that has not happened, ensure the acquisition is registered, apply for your passport, and get a DNI if you plan to spend time in Spain. If you were required to complete any of those within a time limit and did not, raise it — grants can lapse if the holder does not appear to complete the formalities, and that is worth checking rather than assuming.
Two things worth knowing about the wider family. A child born to you after you became Spanish is generally Spanish from birth; a child born before is not, and would need their own route. And your Sephardic status does not automatically transmit as a nationality claim to siblings or cousins — each person applied on their own evidence, and since the window has closed, relatives who did not apply are now on the two-year residence route instead.