So, I put the summary in deepl. Surprisingly, I got an understandable translation. Here is what deepl gave me.
Title: It's been 40 years since I was reincarnated. It's time for this Oji-san to fall in love too.
Summary: Forty years have passed since his reincarnation, and the guild leader, Girold, has been working diligently. Looking back on his life, he realizes that he hasn't been able to get married, so he tries his best to get a girlfriend, but there is no luck. He thinks he's not popular, but the girls around him are trying to approach him...
The harem love comedy from "Shosetsuka ni Narou (Let's become a novelist)" begins!
My thoughts: Yeah, I think this is another dense protagonist who unknowingly made girls fall for him in those 40 years.