First I was so into RTS but now for many years into Space games.
My vision is something bigger then Star citizen

Well I can dream.
But the advice of the pro dev's is to start simple and finish something.
Because that rewarding feeling keeps you going. Instead many attempt at failures by going to big.
So I dream of this big feature creep thing. Which is also fun to brain storm about and make a concept GDD off.
But more practical would be what would be the barely minimum for space game.
And then iterate to add a feature at a time.
Using c++ currently DX11 but will focus on DX12 and one platform W10 PC
As I want to stay alone as long as I can. Which means I need to figure out everything a game needs.
So I go for PCG. Got small library of game programming and design books.
So I start with hello space game.
Figuring out this Entity component system and then the more pure data oriented form.
Reading this DOD online book from Richard Fabian. Very interesting.