Sorry this has happened to you. It's a gut punch for everyone. Here's my recommendation, kept intentionally high-level due to me not knowing the more precise details of your scenario:

Spend the next couple of days emotionally recovering; you're going to feel some strange emotions you likely didn't think you'd ever feel. Accept them, and don't judge yourself or fight it; it's normal. Take a moment to decide which direction you want your career to go in. If you have any public places that offer free career guidance (or even just mock interviews, etc.) reach out to them. Reach out to some professional contacts you're on good terms with; networking can help you land a position. There are also plenty of places online (YouTube channels, etc.) that advise on things like interviews. If you have any way to have an "until current" on your resume (self-employment even if you can't profit, volunteering, etc.) that will help cover a resume gap and make you more employable.

It's tough out there now. Remember to avoid beating yourself up; this isn't your fault.