Workplace Discrimination - Age Discrimination

I've been trying to resolve this on my own but I'm stuck.

competing offer triggered retaliation. I've been dealing with this for about 2 months now and the situation isn't improving.

I have worked at this company for 6 years. My position is exempt and I do have a written employment agreement beyond the standard offer letter.

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

Just want to point out — the statute of limitations might be a factor here. In some states it's as short as 1-2 years. Don't sit on this too long.