I now have PTSD from spending my entire summer dealing with students who voiced the same feelings. Here is what you have to accept: studying beyond 4-6 weeks will not increase your score. If it did then we would have quickly and easily picked up a positive correlation between score and length of dedicated. Alas, no such correlation exists.
There are several reasons for this, but the most prominent is that if you study for 4-6 weeks with appropriate intensity the thought of going beyond that becomes laughable, because you simply have nothing left to give. Second, Step 1 is a maximum of 280 questions drawn from a pool of information so vast that "yield" reaches the point of diminishing returns quite rapidly. Third, people who study past 6 weeks forget the first material they covered. So 9 weeks of dedicated really only nets you what was in weeks 4-9, at best. Fourth, everyone walks into dedicated with gaps, including people who score 250+. Assuming a reasonable amount of review is done, the biggest variable on test day will be your level of mental acuity and stamina, not how many weeks you spent cramming. Finally, longer periods of study present a greater window of opportunity to descend into a panic spiral, which can result in pushing the test back even further, which can incite more panic. It becomes a feedback loop of personal hell that you do not want to find yourself in.