Option Two:
That is to create one's own Dao and achieve immortality as the founder of that Dao. The highest level one can reach is the Quasi-Saint peak, with combat power weaker than Slaying the Three Corpse.
Option Three:
That is to follow the path of Merit Immortals, ultimately reaching the peak of Quasi-Saint as well, though the combat power is slightly weaker than creating one's own Dao and naturally cannot be compared to Slaying the Three Corpse.
These three paths all have their advantages and disadvantages.
To create one's own Dao and achieve immortality as the founder requires not only innate talent based on bloodline but also exceptional comprehension to independently understand a Dao and cultivate it to the limit, which is not something that can be easily achieved.
Among all the living beings in the Three Realms...