Game marketing doesn't fix a game few people want. I'll say it again: MARKETING IS A MULTIPLIER.
If your game is a Flappy Bird clone in 2026, even if you spend $5000 on ads you won't get any sales/wishlists.
If your game has a base value of 0, then anything multiplied by 0 is still 0! So the most awesome most clever marketing in the world won't save a weak game idea.
In order to find success you need to make something people are genuinely excited for. Test your idea's appeal early with real humans. If you do that then your odds off success are infinitely higher than if you just make "yet another 2D Puzzle Platformer"