The progression from now on is a little boring. It will take quite a long time until the system is repaired, so I'm assuming there'll be timeskips. Only when the system is repaired can he start really gaining strength by creating newer, stronger spells and finally evolving. After that I'm going to assume the story will either end or take a trip down "strongest thing in existence travels the multiverse" lane.
Okay let's list the known monstrous nightmare on the void so far.
Devourer of gods (slugs)
Ancient one (octopus)
Shatterer of reality (shadows)
Carnaphos (???)
Doom ringer (???)
He should experiment with his raise undead now that he has infinite mana.. Maybe create a very small spirit to act as a beacon so that others wouldn’t eat it, or create powerful undead, strong enough to deal with gods and the dudes in the void
mememaster69