Dimensional Nephilim

I lobe this story so far, I was wondering if you had a Schedule for this book?

Honestly this is such great stuff

The story seems promising, my only problem is the MC, he is a reincarnator who lived 18 years in this new world, was born into a powerful family and is a nephilim. But he spent 75% of his magic on an attack that was not very strong to kill a stray devil (yes, those that in the first episodes of DxD are easily killed by any of Rias's servants) And then later Lady Shiva (from DC, not to be confused with the god Shiva) a normal human almost killed the MC with a knife when he previously resisted bullets. The real problem is that he has already been in this world for 18 years and this is the power he got in all this time, in the future, possibly soon because normally in this type of novels not many years pass in the world, he will surely receive illogical power ups to be able to face the enemies that come that are much stronger than a normal human that almost kills him. You couldn't have made MC a little OP from the beginning, knowing that he was born into a powerful family, his race and that he have 18 year of time to train and then have him get stronger little by little instead of making it look like he didn't do anything in 18 years.