I'm probably dropping off here. I legitimately don't understand what the audience for this is.
That's not to say it's "bad", but... when you're writing an overpowered protagonist story, you generally lack the ability to create tension in the story through the fear of any kind of direct harm to them (because they're overpowered). That's why these stories generally need something else to keep the audience invested, whether it's a charismatic and compelling main character, an enjoyable cast chemistry, humorous hijinks, overarching mysteries, villains willing to go after their loved ones, longer term tension of the "the protagonist is only overpowered relative to their surroundings, and there are much more powerful people out there whose attention needs to be avoided" nature, etc. Sometimes, depending on the story setup, you'll need to layer more than one of these in order to keep people hooked.
I don't get what the "something else" is for this story:
There's not much in the way of comedy in here, and certainly not enough to carry the whole thing.
There's no overarching mystery at all; we know exactly what's happening and why.
The protagonist has no "loved ones" in any traditional sense, and even if he acquires any:
As demonstrated in the "climax" of this novel, he can literally appear next to them anytime they're in trouble; and
He can just make them into very-powerful-but-not-as-powerful-as-he-is vampires at seemingly no cost to himself.
Our protagonist certainly doesn't seem to care about drawing attention all that much, nor is there any mention of greater beings to be wary of.
The cast is standard harem fare; and the kicker:
This is a supremely uncharismatic main character. "Bragging about being powerful and smart" barely counts as a personality, and it certainly doesn't work as a central draw. It says something that our vampy boy needs to literally cause mind-bending pleasure when sucking blood for us to buy his ability to put together a harem, since he's otherwise so flat as a character that there's nothing for someone to be attracted to.
Hopefully those who stick around can find something to recommend here, but I think I'll leave Kelly Ignacius's Wild Adventures for them.