In the Ranking feature, it is possible to descend a League in all categories, with the exception of Explorers I.
For this reason, once you reach the Trailblazers league, we recommend that you maintain your performance in order to stay in this category and continue to enjoy the rewards it offers.
Within your League, you will find the "promotion zone" and "relegation zone" bars. Once you reach the green bar, you will be in a position to move up to the next League, while if you find yourself in the area delimited by the red bar, you will move down one category.
We recommend that you visit the articles: What is the ranking? and Why did I go down in the Ranking? for more information.