There usually are three or four main elements for game marketing. You need those elements good and  set for launch even if your launch is a soft launch (i.e : launching in early access or beta).

The logo : this is sssoooooooooooo important for the image of your game. For the consumer a bad logo is a bad game. Make a logo with a vector based graphics software to be sure that your logo looks somewhat professional.

The title : not only is this super important for the visual branding of your game but also for the word of mouth. A cathcy title is always a good investment.

Key visuals : once again visual branding is super important and key visuals are vital to show how the game plays. They must be eye catching and vivid.

As you can see I am not following most of the advice that I am giving and this is because I am  a stupid 20 years old student who's trying to make a game while keeping up his studies before he decides that this game should be aborted because it's rubbish and without burning out.

The receipt for a good game is just like a standard receipt :
- you take good products(/skill)
- you cook(/manage) them accordingly
- and you don't forget to pour in your creative personality, do it your way.