Do you also suffer from depression? Then I'd discourage you from forcing yourself to doing expossure therapy in an acute period of depression just for the sake of it!
Most likely you will not have the emotional strength to take up the challenge and take a fair bit of setbacks!
If you do it anyway and you fail, your fears and anxieties will most likely increase. It will have the wrong learning effect and only confirm your negative attitude.
On days you feel good and you push yourself a bit further to do something and it turns out well, the positive experience will help you to perceive these kinds of situations in a more positive way. The more often the better! But it's no quick fix and takes some time but it's still worth trying in any case.
Do you know what exactly triggers your fear or anxiety? If you haven't figured that out, exposure therapy should not be the main therapy of choice. SA is not like fear of spiders, fear of flying or fear of heights. It is very complex.
The problem with social anxiety is that we do not only have fears of certain situations but fear the reactions and valuations of others in general in everyday life and almost constantly. And most of the time we even know that our fear is irrational.