Need advice for telecom domain

nightHawk12

Beginner
Hi all,
I work for a startup as a tester that deals with edge computing use cases like private networks and network expansion. The issue is I have been working for almost 3 years but still not confident enough to answer telecom technicals.
1. I understand this has a good future because of online gaming and streaming growth. But, how do I make myself capable enough for this domain?
2. Should I spend more time learning networking fundamentals and telecom domain or instead learn development and move to a different domain or work profile like DevOps? I think my current skill set matches more with DevOps and system admin kind of roles.
3. I am enthusiastic about CTF too as I can solve easy-level challenges. I am confused between all these and surely can't work on all of them simultaneously.