You can expect an introduction to magic and a power increase in the Raiser arc, as Issei is currently weaker than in the original version. Raiser would sweep the floor with him, even with an incomplete balance breaker. The following chapters will be intermediate before that arc.

That could be easily explained. Since I'm basing this on Re: Zero, in the Ayamatsu route that I'm using as a reference, Subaru died more than 100k times and internally remained the same (although somewhat deviated and obsessive). In this story, Issei is just trying to live like a human. If he abandons his principles, that would make him less human.

Thank you for your support friend. I am re-uploading the chapters here and on other platforms like fanfiction.net. Today, I will probably update on Wattpad.

Don’t worry, remember that Issei is just an ordinary human. Even if he trained for that week before dying, he wouldn’t make much progress. Besides, his physical progress would reset upon death. At that time, he was looking for realistic ways to kill her (poisoning, pushing her in front of a car, stabbing). He had the mindset of a human with human methods of murder. That’s why he failed so many times until he found a supernatural method (My English is not that good either)

Thank you for your support and suggestions, I will update soon.