So, let me get this straight.
The MC became immortal because reasons, and spent all that time researching magic. Suffice to say, he got pretty good at it due to his own merit.
And then, the author also mentions that there's a gamified, level-system. What's exactly the point of having a system that makes it easier to empower your MC, when it was established that the MC's strength has nothing to do with a "system"?
I'm usually not against game-mechanics, but that is downright pointless.