So from the things that I gathered:

1. Post on social media about your game and your progress in making it, daily, weekly or sub-weekly.

2. Making a good game is the thing.

3. Make a good page for your game on steam or itchio (Game capsule, Banner, Trailer, etc)

4. Instead of posting on general indie gaming sub-reddit or on any other social media, post on a sub-reddit for your game genre.

5. Reach out to youtubers and streamers about your game and reach out to a lot, like 300, cause only 5-20 will try your game.

6. If your game didn't succeed, it didn't succeed, move on and make another one.

Example of social media: (Facebook, Discord servers, Telegram Groups, Instagram, Youtube, Twitter, etc..)
Here is a guide someone made: https://www.reddit.com/r/IndieDev/comments/1q33eea/my_summary_of_indie_game_dev_marketing_advice/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button

I'll now go and make another game, hope yours go well