No, for next step of poi, even after passing the first levers, you still need at least 3 players:
Rest of poi I am pretty sure that can be made alone.
You can't do it completely solo due to the puzzles that require more than one player to open passages, such as the vocation's levers and the the PoI Spa. If you have help for that, however, then yes, you can do it solo, even at a relatively low level. Of course, it's very dangerous and require a lot of skills.
Here's a video of an Elite Knight doing it solo at level 165: https://www.youtube.com/watch?v=oJyMULIoye0
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