I know that the imagination is a powerful tool. Do you have any tips for what I can do to overcome social anxiety in the comfort of my home (somewhat like cognitive-behavioral therapy)?

I too have SAD, so I know it’s more than not knowing what to say, but being afraid of what to say.

The only way to rid of a fear is to face is head on. You need to gather up everything you have and go to a restaurant by yourself, or even better with some friends or family you haven’t seen in a while.

While there, no matter how hard it may be, smile at the host, be chatty with the person serving you, and laugh and have a great time with the people accompanying you or even someone just sitting near you.
Don’t let your fear overtake your life.

I know this is not the answer you’re looking for, but it seems to be the only answer that works.