DMCA Takedown — competitor copying my API

I'm dealing with a situation and need some guidance.

competitor copying my API. I've been dealing with this for about 2 weeks now and the situation isn't improving.

This involves software/code I developed over the past 28 months. I do have documentation proving my ownership and timeline.

What are my legal options here? Is it worth pursuing?

Been there. Here's what I learned.

What worked for me was filing with the appropriate government agency. It took 4-8 months but was worth it.