The light novel's ending shows Rudeus at a point where he has come to terms with his past and has used his experiences to shape a better future. He has reconciled with his family to a large extent and has made important contributions to the magical and social aspects of his world. He's also passed on his knowledge and skills to the next generation in a way.
Well, it's not a straightforward mapping. The anime adaptation of Mushoku Tensei might deviate from the manga in terms of plot progression and ending points within season 3. This could be due to various creative decisions or production constraints.
You can start from the chapter where the anime season 2 ended. Usually, you can find this information on manga forums or from fellow fans' discussions.
The anime adaptation of Mushoku Tensei typically aligns with specific points in the manga, but for season 2, it ends around a certain arc that varies depending on the studio's decisions and creative choices.
Hard to say. It could be on hiatus, but without concrete information, it's difficult to give a definite answer. Try following the mangaka's social media or the manga's official website for the latest.