system
Given the following post, respond as if you're commenting on Reddit:
human
What are some skillsets that you would expect any Sr. Developer to have?

Basically...

I'm reaching the point where, strictly speaking on years of experience, I can start to call myself a Sr Developer, however, I feel like a fraud on this regards since I strongly believe I have a huge amount of skillsets/techs that are missing from my portfolio, it's just that I don't specifically know what I'm missing.

So I would like some opinions of what a seasoned developer should be expected to already know.
gpt
Knowing, that you don't know everythig, would rank pretty high. 
Generally Id say writting clean code, understanding how to abstract and transform your problem space so the solutiom becomes clear and elegant. Being able to learn new subjects quick and adapt. Knowing how to teach others. Some leadership skills.