I made a mistake! Notice to vacate

[Amanda A.]

I gave my tenant notice to vacate, thinking they were month-to-month. They're not.

I had all of my tenants set to expire on August 31, 2019 (or so I thought). After, they were moved to month-to-month automatically. This tenant slipped through the cracks...their lease expires in February 2020! They haven't paid rent in 2 months, their dog has chewed a hole in the wall from the bedroom into the living room, and I was going to cut my losses. I've already made the mistake of not checking my lease one last time to be sure, and I should have checked my lease yet again. I get that. How do I move forward now? I don't want these tenants here. Now I feel like eviction is my only option, and I'm not sure what kind of repercussions I could face from sending this notice incorrectly.

Any advice is greatly appreciated!