Steam: Join a Group
Steam is the largest gaming platform, bringing together millions of users worldwide. With the "Join a Group" advertising campaign, developers and community managers can promote their official communities by encouraging players to join Steam groups for news, discussions, and group activities.
To create an advertising campaign, copy the link to your Steam group.

The link might look like this:
https://steamcommunity.com/discussions/forum/2/532101209809499005/
Log into your IPweb account. In the left menu, click "Promotion" — "My Campaigns" — "Add Advertising Campaign" — "Marketplaces" — "Steam" — "Steam: Join a Group".

Enter the link, specify the number of actions for your chosen period, and click the "Save" button. You can find more details on setting up other campaign parameters here.