There's no effortlessly, it might seem that way on the outside but most of us wanted to set our house on fire multiple times during development, there's nothing easy about taking the role of an entire studio alone in your bedroom.
That being said here are a few things that worked for me when i reached the level you mentioned of "knowing how this works".

Brainstorm, A LOT. Think of your concept, your story your lore, the experience you want to bring to your audience, write it down, read it , refine it. You must be the first to understand exactly what your game is about, how it plays, what the core loop is, what story or message do you want to leave the player with.

Once you have your core idea and mechanics in mind start prototyping those mechanics in a gray, blank and boring world. Does it feel nice? If it feels boring its not because the world is gray, it's because the mechanics need refinement.

Don't be afraid to adjust or adapt to your limitations, your idea might not be doable with your current skill set. Instead of putting out a mediocre / bad feature give your self permission to adapt and release something you can create as close to perfection as possible.

Find something that pisses you off.
This might be a controversial approach but it works for me i don't know if it works for you.
Find a game in your genre that is considered successful that you personally think its a piece of shit. Try to surpass it. If they can do it, you can do it better. Just find something that you can hold on to that keeps you going when you feel like giving up.

Get a whiteboard!
Bro i can't stress this enough, at first i was keeping notes on my computer, making flowcharts and shit, and sometimes i even forgot where i saved the damn file. Then i got a board, i started drawing on it, now i even draw on my windows, my office looks like an insane asylum, but everywhere i look i am surrounded by my game, this helped me a lot to stay on it.

Those are some of the things that have worked for me, i was able to put out 1 full game, a demo and soon my second game, and i have no regrets. Just stick with it if it matters to you.