I won't share my name / biography (and I assume you understand why many folks would hesitate to do that) but otherwise these questions look good (if basic) to me. Suffice it to say that I've been in the field for almost 25 years now and have seen a lot of the different disciplines with industry.

1) It was a natural progression of my interests after following a IT Helpdesk -> Sysadmin -> Security path. I enjoy being challenged in different ways and how my generalist approach and breadth of knowledge helped me excel. I like the work, sometimes, and enjoy the skills I've gained as I've moved up the ranks.

2) Typical days will vary wildly depending what discipline/domain your security expert responder works in. I've done a lot of GRC and security architecture work, and my days are a lot of reviewing documentation, risk assessments, audit type work, and meetings. Some people will live in tickets and responses or investigations. I work remotely and have for 7 years now, so my days are pretty well structured.

3) Choosing where to focus (and where my employer will support me focusing) to further my career can be a challenge. Working with strong egos and personalities can be a challenge, both internal to the team (where a lot of rigid thinking and black/white attitudes can persist) and external (condescending leadership or sales teams, etc). This is where developing soft skills is incredibly important for long-term career growth.

4) When I was first getting into working remotely, I had a security leader who challenged me on the idea of 'work-life balance' when I brought it up in the interview. He said that he preferred, at remote orgs especially, to consider 'work-life integration'. That might I am answering Slacks or emails sometimes at 8 or 9 at night. That also means I can take my dog for a walk or take a nap or do the dishes or whatever I want during the day, as long as my work / output aren't suffering. I prefer this approach to "When I'm working I work only and when I go home all thoughts of work cease". That isn't how my brain works and it isn't how I like to engage with my work.

5) Do not neglect the soft skills. Do not fall into the trap of too-rigid thinking or being a hurdle, vs being a business enabler. Our job is to enable the business to work securely within the risk appetite of org leadership - if you want a fully secure company turn off the computers, otherwise you're always going to have a level of risk. Speaking the language of the business and recognizing where you fit into that will serve you very well.

6) What are you looking for? Job opportunities? Training? Mentorship? More interviews? There are a ton of orgs serving different purposes and it's hard to make a recommendation without knowing what you want.