Applied at behavioral health company for Unknown

I recently went through a grueling job application process with a behavioral health company that I considered my dream job. I aced four interviews, receiving praise for my skills and background at each stage. I was invited to interview for a high-level position, and after impressing the interviewers, I was moved to a two-hour IQ assessment. However, I was later informed that the position was filled and was recommended for a lower role. For this lower position, I put in a lot of effort, practicing late into the night for the mock scenario. Again, I received positive feedback for my performance and was moved to the next stage, which was another interview with the team lead. I was praised for my leadership and problem-solving skills, and I even sent my references to the hiring manager to further prove my worth. Despite all this, I was once again told that the position was filled, and they were no longer considering me for any roles. To make matters worse, I checked their LinkedIn and saw that they are still posting job openings for the positions I applied for. I feel numb and exhausted after investing so much time and energy into this process, only to be left with nothing. I lost sleep preparing for these interviews, and I had hoped that my efforts would lead to a job offer. Now, I'm left questioning whether I even want to apply for other positions, especially since a company like this wouldn't hire me after all that effort. It's disheartening.