can you save miraak?

Save Miraak: Fight Hermaeus Mora (Dragonborn DLC Alternate Ending)

No, there is simply no way to finish the quest without killing Miraak. Furthermore, there is no way to kill Hermaeus Mora (in the base game/DLC, at least).

Save Miraak in 2020: Fight Hermeous Mora (Skyrim Special Edition) – ft. Sekiro Combat Mod