Review Detail of Ethernal7 in I Travel into Different Dimensions to Save Humanity

30 chapters in, let's get it..First off, the concept is dope. Could definitely use a lot more world building. Like, I have the vagueist sense of how dimension travel works. .Second off, the novel kinda assumes you are familiar with the three power systems and the power scaling. In a novel like this, clear explanations on each power systems differences and how strong each grade is are absolutely necessary. Without them, I felt like the fights were just arbitrary despite my familiarity with each power system.. Third off, MC doesn't have any clear goals. Like he has super general one's like "get stronger" and "protect my family". Beyond that he might have a goal for a chapter or two before achieving it and moving on. Without any big events forcing MC to react to them, MC should have more clear long term goals like "save this one dude that was a useful comrade in my last life" or "find a reliable weapon". Something to give the story more structure so it actually feel like we're accomplishing something. . Finally, MC is an old man and experienced warrior. Yet as time goes on, it feels like he gets dumber and softer. He doesn't have to be a hardened bad a**, but he was someone that fought on battlefields and explored wastelands for hundreds of years. He shouldn't be shocked at the concept of slavery.