C++ Dame Development

Hello everyone, I need some advice

I’m a game developer with more than a year now working with UE/C++ and I’m looking for an internship.(portfolio)

After looking I started seeing that most companies want c++, without ue.
Also after speaking with developers, they all seem to have somewhat the same advice of strengthening my skills as a software engineer/developer in general.

My question is, where do I start?
Should I keep going with UE, or focus on just c++?
I have basic knowledge of c++, but I don’t know how to make games with it without API libraries or game engines, and I’m at the level where I get stuck between text/video tutorials.

I’d appreciate any advice.