Yes, eventually he will get stronger. But, if you remember the beginning he started off with very little power and no memories. That is the whole point of the story, increasing his power, so he can unlock tattoos, and retrieve his lost memories.
Although, I do believe these vampires will figure out he’s an Origin and will surrender because of it, even if MC maybe weaker than them currently.

an origin, shouldn't he have a higher ranking than them?
He should have "intimidation"...
Like Raizel does...