My 3-Year Facebook Account Suspended

Facebook: "Your account has been temporarily suspended. We regret to inform you that your Instagram account (6vr1r67xqfmbw3uv) has been suspended due to a violation of our rules. We regret to inform you that your account has been suspended due to a violation of our guidelines. If you'd like to contest our decision, please log in to your Instagram account. I haven't done anything wrong; I've been using it for three years. I can't understand why they would close it, and it's impossible to find any information about it. They should at least give me an explanation for this. I'm having trouble making sales because of this. I want it to be fixed.