To connect to another Steam account on your user profile:
In the web or mobile browser, hover over the social media account icon you want to remove and click on it. A tiny 'x' will appear. That will immediately unlink the social media account and you are now free to link another.
On the mobile app, go to edit icon in the top left corner of your user profile and click the red x to disconnect, and reconnect to another account.
You can also get free token airdrops by connecting your Steam on Earn Alliance on the airdrops page. If you have already claimed airdrops using a Steam account, you will not be able to claim airdrops by connecting a different Steam account.