You may be immortal but still bound to the laws of the universe. In the scope of the multiverse theory, if our universe collapses (either with another universe or with a big shrink) your existence will end. Does it now get meaning to become immortal? For else you could just as well question life in general. Life seems to be pointless regardless of immortality.

Alternatively you could freeze yourself in when you're done. If you wont wake up anymore after billions of years, problem solved. If you do, you have something new to explore.