Because a lot of characters in web novels grow in power but not in congition. Their character development may not even exist, but if it does - usually it's a shitty small person to a less shitty small person, and a big person has to deal with big person things not small person things. If your super duper dapper character that can dominate the entire chessboard doesn't have the entire chessboard in their mind when acting, when their vision extends only to a few adjacent squares - then you are writing them wrong. If a character is powerful from the start, their cognition should be such that a person at a lower level would not be able to think on the same level as them as clearly not due to lack of intelligence, but due to lack of vision, experience. Either that or have them see the consequences of not acting at the required level of cognition, like with Sun Wukong, who ended up causing a major ruckus and paid the price. Or, you can have others pay the price and have the character see it. Otherwise, how about not writing a character be pointlessly powerful?
A good novel (and a few exceptional other novels from same setting) is this
Read Hong Huang: I Divide the World Equally with Hongjun / 洪荒:我与鸿钧平分世界 raw light novel translation in English - WTR-LAB
wtr-lab.com
where you can clearly see the gap in cognition between Sages and those below, clan leaders and those below, the goals and strategies and the differences in thinking.
Your character doesn't have to shift your story to city/country/etc-building, but you will have to add a lot of politics, because actions carry consequences and bigger actions carry larger consequences and if a character is so powerful, their every move is like a tsunami - then it can't splash uselessly where nobody can see, because the readers won't either and to see the gravity of the setting, you will have to show those politics. You will probably end up with a lot of side-stories, even arcs where the main character doesn't act at all, if they are too powerful, because if they act all the time it loses its shock factor. In Overlord we mostly see how other characters react to Nazarick and only decisive moments are led by the main characters. In the novel above, as the story progresses, the screen time of main character decreases - but their presence does not.