https://insights.stackoverflow.com/survey/2018/#salary
> The little guys can go to itch.io, which charges as low as 0% commission. They may even have more visibility on there than on Steam, given that it's a smaller pond. There's also the Humble Store, which leaves commission up to the buyer.
Steam has a monopoly. There is no alternative for anyone with revenue below $10 million (hence this change). Itch.io yields about 1% of the revenue of Steam.
The best you can do is sell Steam keys direct from your website, using the Humble Widget which charges 5%. However you will suffer from reduced visibility on the Steam store (since visibility is based on sales).
> They did reduce commissions for everyone by 5%.
No, only once a game reaches $10 million of total sales revenue.