I suppose the MOST acceptable change would be to create different icons for blue quests such as a blue quest icon for alliance raid series,normal raid series,job quest, side story and trial series. Doesnt need much just instead of an exclamation point in the center have it be something else that represents that content.

But even then, most of the side content is given context to what it leads to imo. Heck when you finish a story expansion they always pull an MCU after credits that leads you to the next raid series.