It depends on your preferences. If you like detailed descriptions and inner thoughts, the novel might be for you. But if you enjoy visual storytelling, the manga could be a better choice.
You can try looking on popular manga reading websites like MangaDex or MangaFox. Sometimes, libraries also have digital collections of manga you can access.
I think it depends on his inspiration and motivation. If he has a story he's passionate about, there's a chance. But it could also be that he wants to take a break or focus on other things for now.
The novel," Re-Life in an Otherworld from Zero," could be read on multiple platforms. He could search for the novel's title on PC or search for it on various e-book platforms on mobile devices. In addition, the novel could also be read on mobile applications such as Qidian Chinese Network, Reading Pavilion, etc. The novel had already been published as a manga and animation that could be watched on relevant platforms.
I don't know. Making a new manga is a big decision and involves a lot of effort and commitment. We'll just have to wait and see if Koyoharu Gotouge decides to do it.