is there any plan to do small update to increase max lv?
Not with the story update no, but the guild update will increase the cap to 90. The reason why the storyline update did not increase the cap was because there wasn’t enough content to warrant a raise. This update was meant to be tacked on with the fishing update and the storyline is meant to level you through level 30-60.
So lv 90 going to be after this update?