The most foundational title IMO is AoH.
As Jung wrote, humans don’t really heal emotionally, they just decide to let go [of wounds, trauma]. If every human being has a limited bandwidth for subconscious work the emotional baggage we keep and carry around occupies a good part of our potential. The Letting Go scripting of AoH is kinda the most natural first step to clear it.
It would be interesting to build on this. So after clearing out the baggage and developing the skill to be happy, it would be good to develop the opposite parts:
Who am I?
Who do I want to be?
Maybe borrowing a bit from ME to develop the ideal self image and from Wanted to really appreciate your(new/future)self.
And maybe with a bit of modified Letting Go scripting, not so much regarding wounds and trauma but attitudes, habits, emotional structures that are on there own not good or bad but wouldn’t fit into the new you.