Fired with no reason

So I was fired and told it’s because of “overall suitability with the company and it’s the objectives”. I asked HR and they just repeated the same. What are my options? I am passed probation, was given no verbal or written warnings about anything, I was given more and more work and responsibilities. I was great at my job. This isn’t sitting right with me and I’m hoping someone can advise me on what I can do? I live in Canada