Yes time to restart. Or try weird fleet compositions, or see how little materiel you can get away with deploying in a given fight.
Or, if you care for it, completing your collection of blueprints (or just ships and weapons for your personal fleet). Which then feeds back into the above.
Remnant ships are available via a mod. They're intentionally overpowered, though, so you may not want access to them yourself.
There's also mods. Lots of them. Well, some, but soon lots as they get updated for the current version. Some can be a bit overpowered, so I suggest not instantly learning every blueprint you find until you have a handle on that faction's ships and weapons.
