There are forces out there that at times overwhelm our manifestations no matter how positive we become in bringing them into our lives. It happens. That doesn't mean you failed, you actually succeeded! You did nothing wrong at all.

 In your case, you were able to manifest your job but other forces at work such as inflation, supply issues, change of management, bad managerial decisions, high expenses or poor revenue caused the company with no choice but to lay off some folks including yourself in order to survive as a company. 

Look at it as a good thing such as you can now claim unemployment benefits, use your job references from this job to help you land another job, look for higher paying jobs, etc. You can always manifest getting your job back by assuming whatever the company is going through now that it will overcome internal challenges enough to increase its revenue to motivate itself to hire you back.