For some players that have a long history of successes , it can take quite some time of not making the Weekend Round before dropping down a Skill Tier. 

We also have measures in place to help guard against players’ attempts to manipulate the Skill Tier system. Our advice for players that are having trouble qualifying is, where possible, to play at a lower Skill Tier within a higher difficulty. For example, it can often be more difficult to qualify for Rookie 3 than it is to qualify for Pro 2.