If you want to work in technology fields, you must be a lifelong learner, and behind the learning must be true passion for the work.
The technologies that existed when I was young are obsolete today. They have been supplanted with replacements that have no resemblance to what we used back then.
Look around the room. Any room. Nearly anything you see that uses electricity did not exist when we were young. That "we" covers many members here, too.
If learning new technologies is not your thing, that's okay. If you are truly passionate about learning new technologies, then you are well-suited to the task at hand.
Right now, I am sitting next to my partner. We are watching an old re-run on TV, which I am ignoring. My laptop is on my lap, and on the ottoman is the book, "
How Linux Works" by Brian Ward. I checked it out from the public library. You get the idea.
(Added later, before posting):
I cannot answer the question about whether studying and passing the RHCSA adds value to your career. Speaking for myself, if a subject interests me, I learn it. If the material helps you be a better sysadmin and you find it fun and enjoyable, then go for it. If it is an unpleasant chore, then you must ask yourself: Is it worth the effort?
I will add one more comment. Considering RedHat's recent position regarding open source, do you want to invest your precious life into their proprietary ecosystem? Is there something better, more general, more suitable to the kinds of technology that interest you?
P.S. I started a separate thread about old obsolete technologies here:
https://www.linux.org/threads/technologies-we-grew-up-with-that-are-now-obsolete.45948/