Ideas for fun gloomstalker multi class.

So for context this is my first campaign and I started with a gloomstalker based on recommendations. Im 5 levels in ranger and looking to make the character not so one note. I know assassin rouge is the classic for big damage but it sounds kinda one note. I like the idea of soul knife rouge but don’t know how synergistic it is. I’m open to all suggestions on how I can stay powerful while still having a fun character.