Huh, cool, would be nice if you can go over the story in my signature. Would appreciate if you DMed/commented the light edits.
I'll assume you're here mainly for the editing, as such I'll keep the review a bit shorter.
Synopsis/Tags vs. Content
The Mc's past takes a bit more room than it does in the story, from what I can tell, but that's nothing too major.
Also, from what I understood, his soul weapon was supposed to be the cooking utensil, the canvas being a ruse, yet you have exactly that in your cover.
But other than that, this seems to be fitting.
World
For a spontaneous start, this aspect is done quite well. Soul weapons give means of personal growth/expansion of existing characters. So long as the MC isn't the only one with a "misfit", this aspect can add engaging twists to many characters.
The dark elves idea also was an interesting one, so is "drugs for enlightenment".
This next part might simply be due to lack of understanding on the subject, but "mana exists only in solid form" and "places with abundant mana boost magic" feel contradictory to me. And even if it wasn't theoretically, I would expect that people would first have to learn how to make use of this environment before profiting from it.
Also, perhaps I missed something, or you just cut that part for convenience, but the 'catalyst' explained in the first chapter rarely makes an actual appearance.
Characters
Louis, as you yourself have said, seems relatively free of his past life's influence. Ten years of dense new experiences being more memorable than his last thousand of essentially the same makes sense, yet as far as character is concerned, he reads the exact same as transmigrators from modern earth in other "adult in child's body" novels I've read. There is comparison in nomenclature and strength, but rarely in values.
His first few remarks in the library are a good start, but values like filiality, often stressed in cultivation worlds, quickly seem to fade.
If he has no drive to conquer any more, why does he spend more time working on his drug busyness than most other things?
Carlos' sole reason for existence seems to be serving as a lesser version of the MC.
His Family is a well done base, the revelation of more reincarnators being present adds a nice twist.
Plot
You start off with a relatively clichee'd "child reincarnator" setting, which I think is part of the meta comedy, but I'm not sure.
If it is, I'm lacking reaction to the existence of tropes beyond simple nods at their existence. This might be personal preference in humor, though. For making fun of tropes, I find that blowing them out of proportion works best, in this case making him even more OP.
If not, consider cutting the explanations for characters' actions and/or make the MC praise more subtle. Typing out that the difference in address between Louis and Carlos reflects the difference in respect the butler holds for the two for example was immersion breaking more than anything else.
From synopsis and what I've read, other characters seem to be a big part, each having their own issues and plots. But the lack of care coming from the MC, while keeping him from meddling, also prevented me from really getting involved. Especially in a 60 chapter novel, this could end up costing you precious time. The info dumps regarding magic and the MC's daily life seem to be the bigger focus at this point.
Writing and Grammar
Even outside of the praise issue mentioned above, you sometimes repeat the meaning of dialogue unnecessarily. From my perspective, your dialogue is expressive enough, letting the reader reach the obvious conclusion themselves still feels more organic than forcing it.
You tend to introduce multiple characters in batch, giving them little reading time on their first appearance, which, for me at least, is detrimental to learning their names/make described aspects memorable.
