I recommend you to read " Since the Devour of the Starry Sky ". It's also a novel that travels across the universe. It has a similar background of the Immortal Cultivation civilization as " The Defiant Immortal ". At the same time, it also adds the elements of infinite flow and traveling through time and space. The protagonist will not leave his main plot, nor will he follow the protagonist's ass. It's very suitable for readers who like calm and rational protagonists. I hope you like my recommendation.