Why should everyhing be in threes and so damn final in big entertainment land? I like the "will return in Story Title n+1" endings. Even when it never even materializes. Or the eternal spinoffs of spinoffs (which a lot of Star Wars kinda already are). Or the crossover in other works as a background character easter eggs (which I believe Star Wars have done occasionally too). Or Marvel type crossovers (but comics, the MCU multiverse thingy crossovers are getting a bit tiresome by now) (also no, dont bring wolverine into Star Wars, please) (no, not Deadpool or Spiderman either) (oh, the alternative is putting mandalorians in every Star Wars you say?).
Anyway, let the protagonist and closest allies survive, let him walk into the sunset, and be open for more adventures another day. In their own or as a mentor in someone else's story.
Hey, the original Star Wars was a trilogy of trilogies, each standalone and with their own final chapter. I’m sure this series can do the same, especially with the copious amount of profit.