If you know C++ already, Unreal is a much more natural starting point than either Unity or Godot.
Unreal is what gets used in many AAA shops - it's not a monopoly by any means but it is the most common off-the-shelf engine in the industry. Unity's main edge is that it's easy to learn but if you are comfortable in C++ then there's no real benefit to Unity.
Godot uses GDScript, which is a custom scripting language that's meant to be easy to learn. It's FOSS so you don't need to worry about being screwed over - but it's a lot less mature than something like Unreal which can ship on everything you can think of.
But my advice is to make small things. Don't hyperfocus on a dream game. Just make things that will take a weekend (maybe a week at most). Then move on to something else.
When I was getting into game dev, I made a couple simple projects then jumped into my dream game. I spent so long making that one game that I never finished.
When I got hired in the industry, they cared more about what I released than what my education or job experience was. Because that one big game was never finished, I wound up with my smaller "just getting started" games on my resume; stuff I had made but wasn't proud of. But those games were at least finished and available to the public... and they were what got me hired, not my magnum opus overscoped unfinished indie game I never completed.
