The english dub of the 2013 3D GC movie is available on Tubi:
Harlock: Space Pirate (2014)
As a side note the universe Albator take place in is pretty damn big and include around 30 titles made between the 1970s and 2010s, most notably: Galaxy Express 999, Queen Millenia, Maetel Legend, Queen Emeraldas and The Galaxy Railways.
Albator 78 (Captain Harlock) and Galaxy Express 999 can be watched for free on
Crunchyroll, but for some reason a premium account is needed to watch Albator 84 (Endless Orbit SSX).
What happened with Goldorak was fairly unique, it was a much bigger success in Europe and Quebec than in Japan. And due to the unfortunate timing of the original run ending in 1977 in Japan, a mere 2 years before Gundam came out. Gundam quickly established itself as the unchallenged reference and influence in the genre until the mid-1990s. Goldorak was never able to capitalize on its early international success (other than Mattel making Goldorak toys) and the franchise was pretty much abandoned and forgotten.