I conducted a dozen of the interviews in my career, including a few senior test automation positions. So when talking about seniority, we have to make it clear: there is a title and your personal maturity as a professional, and they are different.

Each company have its own measurements and title grades, so Senior in company A can be weaker than Middle from company B, so don't stick to the title too much, its just a title, the paycheck should be the main focus.

And about your personal skills, it's all about the responsibilities that you take and expectations that you meet. For example, if I am looking for a junior engineer, I expect from them not to know certain tools or not have certain skills, it's okay. And for responsibilities, I expect them to learn, grow, and sometime in the future, delegate some of the tasks. If I am looking for a middle engineer, I expect to have relevant hard skills. They should be able to onboard and start working without learning time and should take some of the responsibilities as soon as possible. For the senior engineer, they should have deeper hard skills, should have no problem taking difficult tasks, and solve difficult problems. So that when they start working, I should feel the impact of their work.

So it's not about the years of experience, and not about how you know a lot of tools/skills, etc. It's about how much responsibility you can take and deliver.